ACK/cmnt: [Resend][pull request][SRU][Zesty] Support SMMU passthrough using the default domain

[Stefan Bader]

Ok, seems to have gotten some testing on amd64 at least. Also now all upstream
(as of v4.12-rc1). But again, as with the other iommu update, this should be
carefully observed with any io bound testing.

-Stefan

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