dt-bindings: display: msm: dp-controller: document SM8450 compatible

The SM8450 & SM350 shares the same DT TX IP version, use the
SM8350 compatible as fallback for SM8450.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/527564/
Link: https://lore.kernel.org/r/20230206-topic-sm8450-upstream-dp-controller-v6-1-d78313cbc41d@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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

@@ -15,16 +15,21 @@ description: |
 
 properties:
   compatible:
-    enum:
-      - qcom,sc7180-dp
-      - qcom,sc7280-dp
-      - qcom,sc7280-edp
-      - qcom,sc8180x-dp
-      - qcom,sc8180x-edp
-      - qcom,sc8280xp-dp
-      - qcom,sc8280xp-edp
-      - qcom,sdm845-dp
-      - qcom,sm8350-dp
+    oneOf:
+      - enum:
+          - qcom,sc7180-dp
+          - qcom,sc7280-dp
+          - qcom,sc7280-edp
+          - qcom,sc8180x-dp
+          - qcom,sc8180x-edp
+          - qcom,sc8280xp-dp
+          - qcom,sc8280xp-edp
+          - qcom,sdm845-dp
+          - qcom,sm8350-dp
+      - items:
+          - enum:
+              - qcom,sm8450-dp
+          - const: qcom,sm8350-dp
 
   reg:
     minItems: 4