iommu/amd: Refactor attaching / detaching device functions

If domain is configured with V2 page table then setup default GCR3
with domain GCR3 pointer. So that all devices in the domain uses same page
table for translation. Also return page table setup status from do_attach()
function.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240205115615.6053-12-vasant.hegde@amd.com


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