dt-bindings: memory-controller: Drop unneeded quotes

Cleanup bindings dropping unneeded quotes. Once all these are fixed,
checking for this can be enabled in yamllint.

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

Documentation/devicetree/bindings/memory-controllers/renesas,dbsc.yaml

···
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: "http://devicetree.org/schemas/memory-controllers/renesas,dbsc.yaml#"
-$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+$id: http://devicetree.org/schemas/memory-controllers/renesas,dbsc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Renesas DDR Bus Controllers
 

Documentation/devicetree/bindings/memory-controllers/renesas,rpc-if.yaml

···
   - if it contains "cfi-flash", then HyperFlash is used.
 
 allOf:
-  - $ref: "/schemas/spi/spi-controller.yaml#"
+  - $ref: /schemas/spi/spi-controller.yaml#
 
 properties:
   compatible:

Documentation/devicetree/bindings/memory-controllers/samsung,exynos5422-dmc.yaml

···
     maxItems: 8
 
   devfreq-events:
-    $ref: '/schemas/types.yaml#/definitions/phandle-array'
+    $ref: /schemas/types.yaml#/definitions/phandle-array
     minItems: 1
     maxItems: 16
     items:
···
     description: phandles of the PPMU events used by the controller.
 
   device-handle:
-    $ref: '/schemas/types.yaml#/definitions/phandle'
+    $ref: /schemas/types.yaml#/definitions/phandle
     description: |
       phandle of the connected DRAM memory device. For more information please
       refer to jedec,lpddr3.yaml.
···
       - description: registers of DREX1
 
   samsung,syscon-clk:
-    $ref: '/schemas/types.yaml#/definitions/phandle'
+    $ref: /schemas/types.yaml#/definitions/phandle
     description: |
       Phandle of the clock register set used by the controller, these registers
       are used for enabling a 'pause' feature and are not exposed by clock