iommu/arm-smmu-qcom: Add SDM670 MDSS compatible

Add the compatible for the MDSS client on the Snapdragon 670 so it can
be properly configured by the IOMMU driver.

Otherwise, there is an unhandled context fault.

Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230925234246.900351-3-mailingradian@gmail.com


Signed-off-by: Will Deacon <will@kernel.org>