dt-bindings: display/msm: sm8150-mdss: add DP node

As Qualcomm SM8150 got support for the DisplayPort, add displayport@
node as a valid child to the MDSS node.

Fixes: 88806318 ("dt-bindings: display: msm: dp: declare compatible string for sm8150")
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/586156/
Link: https://lore.kernel.org/r/20240402-fd-fix-schema-v3-1-817ea6ddf775@linaro.orgSigned-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>

Documentation/devicetree/bindings/display/msm/qcom,sm8150-mdss.yaml

@@ -53,6 +53,15 @@ patternProperties:
       compatible:
         const: qcom,sm8150-dpu
 
+  "^displayport-controller@[0-9a-f]+$":
+    type: object
+    additionalProperties: true
+
+    properties:
+      compatible:
+        contains:
+          const: qcom,sm8150-dp
+
   "^dsi@[0-9a-f]+$":
     type: object
     additionalProperties: true