dt-bindings: Drop unnecessary pinctrl properties

For a single pinctrl mode, it is not necessary to define pinctrl
properties as the tools always allow pinctrl properties.

Signed-off-by: Rob Herring <[e-mail]>
Acked-by: Charles Keepax <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/display/rockchip/rockchip,rk3066-hdmi.yaml

···
   clock-names:
     const: hclk
 
-  pinctrl-0:
-    maxItems: 2
-
-  pinctrl-names:
-    const: default
-    description:
-      Switch the iomux for the HPD/I2C pins to HDMI function.
-
   power-domains:
     maxItems: 1
 

Documentation/devicetree/bindings/input/gpio-keys.yaml

···
             which can be disabled to suppress events from the button.
           type: boolean
 
-        pinctrl-0:
-          maxItems: 1
-
-        pinctrl-names:
-          maxItems: 1
-
       required:
         - linux,code
 

Documentation/devicetree/bindings/pinctrl/cirrus,lochnagar.yaml

···
       appropriate of the LOCHNAGARx_PIN_NUM_GPIOS define, see [3].
     maxItems: 1
 
-  pinctrl-0:
-    description:
-      A phandle to the default pinctrl state.
-
-  pinctrl-names:
-    description:
-      A pinctrl state named "default" must be defined.
-    const: default
-
   pin-settings:
     type: object
     patternProperties:

Documentation/devicetree/bindings/pinctrl/cirrus,madera.yaml

···
     Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
 
 properties:
-  pinctrl-0:
-    description:
-      A phandle to the node containing the subnodes containing default
-      configurations.
-
-  pinctrl-names:
-    description:
-      A pinctrl state named "default" must be defined.
-    const: default
-
   pin-settings:
     description:
       One subnode is required to contain the default settings. It

Documentation/devicetree/bindings/sound/samsung-i2s.yaml

···
       Internal DMA register base address of the audio
       subsystem (used in secondary sound source).
 
-  pinctrl-0:
-    description: Should specify pin control groups used for this controller.
-
-  pinctrl-names:
-    const: default
-
   power-domains:
     maxItems: 1