dt-bindings: display/msm/gmu: Add Adreno 663 GMU

Document Adreno 663 GMU in the dt-binding specification.

Signed-off-by: Puranam V G Tejaswi <quic_pvgtejas@quicinc.com>
Signed-off-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Patchwork: https://patchwork.freedesktop.org/patch/620771/
Signed-off-by: Rob Clark <robdclark@chromium.org>

Author: pvgtejas-quic

Documentation/devicetree/bindings/display/msm/gmu.yaml

@@ -125,6 +125,7 @@ allOf:
             enum:
               - qcom,adreno-gmu-635.0
               - qcom,adreno-gmu-660.1
+              - qcom,adreno-gmu-663.0
     then:
       properties:
         reg: