iommu/arm-smmu-qcom: Add Qualcomm SC8180X impl

The primary SMMU found in Qualcomm SC8180X platform needs to use the
Qualcomm implementation, so add a specific compatible for this.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210121014005.1612382-2-bjorn.andersson@linaro.org


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