dt-bindings: arm-smmu: Document SM8650 GPU SMMU

Document the GPU SMMU found on the SM8650 platform.
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/578685/Signed-off-by: Rob Clark <robdclark@chromium.org>

Documentation/devicetree/bindings/iommu/arm,smmu.yaml

@@ -93,6 +93,7 @@ properties:
               - qcom,sm8350-smmu-500
               - qcom,sm8450-smmu-500
               - qcom,sm8550-smmu-500
+              - qcom,sm8650-smmu-500
           - const: qcom,adreno-smmu
           - const: qcom,smmu-500
           - const: arm,mmu-500
@@ -514,7 +515,9 @@ allOf:
       properties:
         compatible:
           items:
-            - const: qcom,sm8550-smmu-500
+            - enum:
+                - qcom,sm8550-smmu-500
+                - qcom,sm8650-smmu-500
             - const: qcom,adreno-smmu
             - const: qcom,smmu-500
             - const: arm,mmu-500
@@ -553,7 +556,6 @@ allOf:
               - qcom,sdx65-smmu-500
               - qcom,sm6350-smmu-500
               - qcom,sm6375-smmu-500
-              - qcom,sm8650-smmu-500
               - qcom,x1e80100-smmu-500
     then:
       properties: