Add a node for the APPS SMMU, to which various devices such as USB and
storage nodes are connected.

[Marijn: add the new, generic, "qcom,smmu-500" compatible, add patch
 description, reorder # properties]
Signed-off-by: Martin Botka <martin.botka@somainline.org>
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221222193254.126925-3-marijn.suijten@somainline.org