dt-bindings: pwm: drop unneeded quotes

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

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230609140709.64655-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/pwm/atmel,at91sam-pwm.yaml

@@ -11,7 +11,7 @@ maintainers:
   - Claudiu Beznea <claudiu.beznea@microchip.com>
 
 allOf:
-  - $ref: "pwm.yaml#"
+  - $ref: pwm.yaml#
 
 properties:
   compatible:

Documentation/devicetree/bindings/pwm/mxs-pwm.yaml

@@ -25,7 +25,7 @@ properties:
     const: 3
 
   fsl,pwm-number:
-    $ref: '/schemas/types.yaml#/definitions/uint32'
+    $ref: /schemas/types.yaml#/definitions/uint32
     description: u32 value representing the number of PWM devices
 
 required: