iommu/amd: Refactor protection_domain helper functions

To removes the code to setup GCR3 table, and only handle domain
create / destroy, since GCR3 is no longer part of a domain.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240205115615.6053-13-vasant.hegde@amd.com


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