dt-bindings: display: msm: dp-controller: document SA8775P compatible

Add compatible string for the DisplayPort controller found on the
Qualcomm SA8775P platform.

Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Soutrik Mukhopadhyay <quic_mukhopad@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/620315/
Link: https://lore.kernel.org/r/20241018070706.28980-5-quic_mukhopad@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Documentation/devicetree/bindings/display/msm/dp-controller.yaml

@@ -17,6 +17,7 @@ properties:
   compatible:
     oneOf:
       - enum:
+          - qcom,sa8775p-dp
           - qcom,sc7180-dp
           - qcom,sc7280-dp
           - qcom,sc7280-edp