dt-bindings: clock: qcom,sm8550-dispcc: reference qcom,gcc.yaml

Just like most of Qualcomm clock controllers, we can reference common
qcom,gcc.yaml schema to unify the common parts of the binding.

Reviewed-by: Dmitry Baryshkov <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

Documentation/devicetree/bindings/clock/qcom,sm8550-dispcc.yaml

···
       - description: Link clock from DP PHY3
       - description: VCO DIV clock from DP PHY3
 
-  '#clock-cells':
-    const: 1
-
-  '#reset-cells':
-    const: 1
-
-  '#power-domain-cells':
-    const: 1
-
-  reg:
-    maxItems: 1
-
   power-domains:
     description:
       A phandle and PM domain specifier for the MMCX power domain.
···
 
 required:
   - compatible
-  - reg
   - clocks
-  - '#clock-cells'
-  - '#reset-cells'
   - '#power-domain-cells'
 
-additionalProperties: false
+allOf:
+  - $ref: qcom,gcc.yaml#
+
+unevaluatedProperties: false
 
 examples:
   - |