dt-bindings: Remove more cases of 'allOf' containing a '$ref'

Another wack-a-mole pass of killing off unnecessary 'allOf + $ref'
usage.

json-schema versions draft7 and earlier have a weird behavior in that
any keywords combined with a '$ref' are ignored (silently). The correct
form was to put a '$ref' under an 'allOf'. This behavior is now changed
in the 2019-09 json-schema spec and '$ref' can be mixed with other
keywords. The json-schema library doesn't yet support this, but the
tooling now does a fixup for this and either way works.

This has been a constant source of review comments, so let's change this
treewide so everyone copies the simpler syntax.

Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/display/brcm,bcm2835-hdmi.yaml

···
       - const: hdmi
 
   ddc:
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
     description: >
       Phandle of the I2C controller used for DDC EDID probing
 

Documentation/devicetree/bindings/iio/adc/qcom,spmi-vadc.yaml

···
             input signal is multiplied. For example, <1 3> indicates the signal is scaled
             down to 1/3 of its value before ADC measurement.
             If property is not found default value depending on chip will be used.
-        allOf:
-          - $ref: /schemas/types.yaml#/definitions/uint32-array
+        $ref: /schemas/types.yaml#/definitions/uint32-array
         oneOf:
           - items:
               - const: 1

Documentation/devicetree/bindings/interrupt-controller/mti,gic.yaml

···
       Specifies the list of CPU interrupt vectors to which the GIC may not
       route interrupts. This property is ignored if the CPU is started in EIC
       mode.
-    allOf:
-      - $ref: /schemas/types.yaml#definitions/uint32-array
-      - minItems: 1
-        maxItems: 6
-        uniqueItems: true
-        items:
-          minimum: 2
-          maximum: 7
+    $ref: /schemas/types.yaml#definitions/uint32-array
+    minItems: 1
+    maxItems: 6
+    uniqueItems: true
+    items:
+      minimum: 2
+      maximum: 7
 
   mti,reserved-ipi-vectors:
     description: |
···
       It accepts two values: the 1st is the starting interrupt and the 2nd is
       the size of the reserved range. If not specified, the driver will
       allocate the last (2 * number of VPEs in the system).
-    allOf:
-      - $ref: /schemas/types.yaml#definitions/uint32-array
-      - items:
-          - minimum: 0
-            maximum: 254
-          - minimum: 2
-            maximum: 254
+    $ref: /schemas/types.yaml#definitions/uint32-array
+    items:
+      - minimum: 0
+        maximum: 254
+      - minimum: 2
+        maximum: 254
 
   timer:
     type: object

Documentation/devicetree/bindings/media/i2c/dongwoon,dw9768.yaml

···
   dongwoon,aac-mode:
     description:
       Indication of AAC mode select.
-    allOf:
-      - $ref: "/schemas/types.yaml#/definitions/uint32"
-      - enum:
-          - 1    #  AAC2 mode(operation time# 0.48 x Tvib)
-          - 2    #  AAC3 mode(operation time# 0.70 x Tvib)
-          - 3    #  AAC4 mode(operation time# 0.75 x Tvib)
-          - 5    #  AAC8 mode(operation time# 1.13 x Tvib)
-        default: 2
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    enum:
+      - 1    #  AAC2 mode(operation time# 0.48 x Tvib)
+      - 2    #  AAC3 mode(operation time# 0.70 x Tvib)
+      - 3    #  AAC4 mode(operation time# 0.75 x Tvib)
+      - 5    #  AAC8 mode(operation time# 1.13 x Tvib)
+    default: 2
 
   dongwoon,aac-timing:
     description:
       Number of AAC Timing count that controlled by one 6-bit period of
       vibration register AACT[5:0], the unit of which is 100 us.
-    allOf:
-      - $ref: "/schemas/types.yaml#/definitions/uint32"
-      - default: 0x20
-        minimum: 0x00
-        maximum: 0x3f
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    default: 0x20
+    minimum: 0x00
+    maximum: 0x3f
 
   dongwoon,clock-presc:
     description:
       Indication of VCM internal clock dividing rate select, as one multiple
       factor to calculate VCM ring periodic time Tvib.
-    allOf:
-      - $ref: "/schemas/types.yaml#/definitions/uint32"
-      - enum:
-          - 0    #  Dividing Rate -  2
-          - 1    #  Dividing Rate -  1
-          - 2    #  Dividing Rate -  1/2
-          - 3    #  Dividing Rate -  1/4
-          - 4    #  Dividing Rate -  8
-          - 5    #  Dividing Rate -  4
-        default: 1
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    enum:
+      - 0    #  Dividing Rate -  2
+      - 1    #  Dividing Rate -  1
+      - 2    #  Dividing Rate -  1/2
+      - 3    #  Dividing Rate -  1/4
+      - 4    #  Dividing Rate -  8
+      - 5    #  Dividing Rate -  4
+    default: 1
 
 required:
   - compatible

Documentation/devicetree/bindings/pci/ti,j721e-pci-ep.yaml

···
   ti,syscon-pcie-ctrl:
     description: Phandle to the SYSCON entry required for configuring PCIe mode
                  and link speed.
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   power-domains:
     maxItems: 1

Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml

···
   ti,syscon-pcie-ctrl:
     description: Phandle to the SYSCON entry required for configuring PCIe mode
       and link speed.
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   power-domains:
     maxItems: 1

Documentation/devicetree/bindings/sound/maxim,max98390.yaml

···
     description: I2C address of the device.
 
   maxim,temperature_calib:
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32
     description: The calculated temperature data was measured while doing the calibration.
+    $ref: /schemas/types.yaml#/definitions/uint32
     minimum: 0
     maximum: 65535
 
   maxim,r0_calib:
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/uint32
     description: This is r0 calibration data which was measured in factory mode.
+    $ref: /schemas/types.yaml#/definitions/uint32
     minimum: 1
     maximum: 8388607
 

Documentation/devicetree/bindings/sound/nvidia,tegra186-dspk.yaml

···
 
   sound-name-prefix:
     pattern: "^DSPK[1-9]$"
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/string
+    $ref: /schemas/types.yaml#/definitions/string
     description:
       Used as prefix for sink/source names of the component. Must be a
       unique string among multiple instances of the same component.

Documentation/devicetree/bindings/sound/nvidia,tegra210-dmic.yaml

···
 
   sound-name-prefix:
     pattern: "^DMIC[1-9]$"
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/string
+    $ref: /schemas/types.yaml#/definitions/string
     description:
       used as prefix for sink/source names of the component. Must be a
       unique string among multiple instances of the same component.

Documentation/devicetree/bindings/sound/nvidia,tegra210-i2s.yaml

···
 
   sound-name-prefix:
     pattern: "^I2S[1-9]$"
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/string
+    $ref: /schemas/types.yaml#/definitions/string
     description:
       Used as prefix for sink/source names of the component. Must be a
       unique string among multiple instances of the same component.

Documentation/devicetree/bindings/sound/ti,j721e-cpb-audio.yaml

···
 
   ti,cpb-mcasp:
     description: phandle to McASP used on CPB
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   ti,cpb-codec:
     description: phandle to the pcm3168a codec used on the CPB
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   clocks:
     items:

Documentation/devicetree/bindings/sound/ti,j721e-cpb-ivi-audio.yaml

···
 
   ti,cpb-mcasp:
     description: phandle to McASP used on CPB
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   ti,cpb-codec:
     description: phandle to the pcm3168a codec used on the CPB
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   ti,ivi-mcasp:
     description: phandle to McASP used on IVI
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   ti,ivi-codec-a:
     description: phandle to the pcm3168a-A codec on the expansion board
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   ti,ivi-codec-b:
     description: phandle to the pcm3168a-B codec on the expansion board
-    allOf:
-      - $ref: /schemas/types.yaml#/definitions/phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
 
   clocks:
     items: