dt-bindings: display: msm: dp: declare compatible string for sm8150

Add compatible string for the DisplayPort controller found on the
Qualcomm SM8150 platform.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/571438/
Link: https://lore.kernel.org/r/20231209232132.3580045-2-dmitry.baryshkov@linaro.org

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

@@ -29,6 +29,7 @@ properties:
           - qcom,sm8650-dp
       - items:
           - enum:
+              - qcom,sm8150-dp
               - qcom,sm8250-dp
               - qcom,sm8450-dp
               - qcom,sm8550-dp