dt-bindings: display/msm: Document the DPU for SA8775P

Document the DPU for Qualcomm SA8775P platform.

Signed-off-by: Mahadevan <quic_mahap@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/620494/
Link: https://lore.kernel.org/r/20241019-patchv3_1-v5-2-d2fb72c9a845@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Author: Mahadevan

Documentation/devicetree/bindings/display/msm/qcom,sm8650-dpu.yaml

@@ -14,6 +14,7 @@ $ref: /schemas/display/msm/dpu-common.yaml#
 properties:
   compatible:
     enum:
+      - qcom,sa8775p-dpu
       - qcom,sm8650-dpu
       - qcom,x1e80100-dpu