dt-bindings: arm-smmu: Add compatible for Qualcomm SC8280XP

Add compatible for the Qualcomm SC8280XP platform to the ARM SMMU
DeviceTree binding.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220503163429.960998-2-bjorn.andersson@linaro.org


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