dt-bindings: arm-smmu: update binding for qcom sc7180 SoC

Add the soc specific compatible for sc7180 smmu-500
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>

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

@@ -34,6 +34,7 @@ properties:
       - description: Qcom SoCs implementing "arm,mmu-500"
         items:
           - enum:
+              - qcom,sc7180-smmu-500
               - qcom,sdm845-smmu-500
           - const: arm,mmu-500
       - items: