dt-bindings: memory-controllers: drop unneeded quotes

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

Link: https://lore.kernel.org/r/20230609140720.64743-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: krzk

Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.yaml

@@ -165,7 +165,7 @@ patternProperties:
         const: 0
 
       lpddr2:
-        $ref: "ddr/jedec,lpddr2.yaml#"
+        $ref: ddr/jedec,lpddr2.yaml#
         type: object
 
     patternProperties:

Documentation/devicetree/bindings/memory-controllers/ti,gpmc.yaml

@@ -129,7 +129,7 @@ patternProperties:
       The child device node represents the device connected to the GPMC
       bus. The device can be a NAND chip, SRAM device, NOR device
       or an ASIC.
-    $ref: "ti,gpmc-child.yaml"
+    $ref: ti,gpmc-child.yaml
 
 
 required: