This commit (166bdbd2316116 iommu/arm-smmu: Add support for MSI on
SMMUv3) depends on a huge MSI change on 4.2/4.3 which could cause PCI
and MSI related driver changes.

Consider the following concern:
1, big effort to backport the MSI domain/list changes.
2, msi_desc struct change would cause MSI related downstream driver
rewriting which works on 4.1 kernel.
3, I have no suitable arm64 board in hands, my test relay on Naresh who
living in India. So the testing would become unbearable for such big
changes.

So I want to skip this commit in the IOMMU backporting. and suggest
using LSK 4.4 kernel if someone really want the platform MSI.
Any comments?