From: pbrobinson on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1249#note_6232...
This is arm64 only so it should really just be enabled in
common/generic/arm/aarch64/ and the option to disable it can be removed as
it's already common/generic/CONFIG_VIRTIO_IOMMU and actually doesn't need to
be there at all being explicitly an arm64 feature.