media: dt-bindings: amlogic,meson-gx-ao-cec: reference common CEC properties

Reference common HDMI CEC adapter properties to simplify the binding and
have only one place of definition for common properties.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/devicetree/bindings/media/cec/amlogic,meson-gx-ao-cec.yaml

@@ -33,11 +33,8 @@ properties:
   interrupts:
     maxItems: 1
 
-  hdmi-phandle:
-    description: phandle to the HDMI controller
-    $ref: /schemas/types.yaml#/definitions/phandle
-
 allOf:
+  - $ref: cec-common.yaml#
   - if:
       properties:
         compatible:
@@ -81,7 +78,7 @@ required:
   - clocks
   - clock-names
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |