dt-bindings: arm-smmu: Add sc7180 compatible string

This patch simply adds a new compatible string for SC7180 platform.
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
Link: https://lore.kernel.org/r/1588329036-18732-2-git-send-email-smasetty@codeaurora.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

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

@@ -28,6 +28,7 @@ properties:
           - enum:
               - qcom,msm8996-smmu-v2
               - qcom,msm8998-smmu-v2
+              - qcom,sc7180-smmu-v2
               - qcom,sdm845-smmu-v2
           - const: qcom,smmu-v2