dt-bindings: display/msm: dp-controller: document DP on SM7150

The qcom,sm7150-dp compatible is documented in schema. Mark DisplayPort
controller as compatible with SM8350.

Fixes: 726eded12d ("dt-bindings: display/msm: Add SM7150 MDSS")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Patchwork: https://patchwork.freedesktop.org/patch/672572/
Link: https://lore.kernel.org/r/20250903-dp_mst_bindings-v8-3-7526f0311eaa@oss.qualcomm.com

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

@@ -44,6 +44,7 @@ properties:
       - items:
           - enum:
               - qcom,sar2130p-dp
+              - qcom,sm7150-dp
               - qcom,sm8150-dp
               - qcom,sm8250-dp
               - qcom,sm8450-dp

Documentation/devicetree/bindings/display/msm/qcom,sm7150-mdss.yaml

@@ -61,7 +61,8 @@ patternProperties:
     additionalProperties: true
     properties:
       compatible:
-        const: qcom,sm7150-dp
+        contains:
+          const: qcom,sm7150-dp
 
   "^dsi@[0-9a-f]+$":
     type: object
@@ -378,7 +379,8 @@ examples:
         };
 
         displayport-controller@ae90000 {
-            compatible = "qcom,sm7150-dp";
+            compatible = "qcom,sm7150-dp",
+                         "qcom,sm8350-dp";
             reg = <0xae90000 0x200>,
                   <0xae90200 0x200>,
                   <0xae90400 0xc00>,