dt-bindings: iommu: qcom: Add Qualcomm MSM8953 compatible

Document the compatible used for IOMMU on the msm8953 SoC.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20221105142016.93406-1-luca@z3ntu.xyz


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