iommu/amd: Consolidate amd_iommu_domain_flush_complete() call

Call amd_iommu_domain_flush_complete() from domain_flush_pages().
That way we can remove explicit call of amd_iommu_domain_flush_complete()
from various places.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20231122090215.6191-8-vasant.hegde@amd.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>