dt-bindings: arm-smmu: Add compatible for Qualcomm SM6375

Add a compatible for Qualcomm SM6375's broken-as-usual MMU500 impl.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20220716193223.455859-1-konrad.dybcio@somainline.org


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