dt-bindings: iommu: arm-smmu: add sdm670 compatible

The Snapdragon 670 needs the IOMMU for GENI I2C. Add a compatible string in
the documentation to represent its support.
Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221111003606.126795-2-mailingradian@gmail.comSigned-off-by: Will Deacon <will@kernel.org>

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

@@ -39,6 +39,7 @@ properties:
               - qcom,sc7280-smmu-500
               - qcom,sc8180x-smmu-500
               - qcom,sc8280xp-smmu-500
+              - qcom,sdm670-smmu-500
               - qcom,sdm845-smmu-500
               - qcom,sdx55-smmu-500
               - qcom,sdx65-smmu-500