iommu/amd: Store the nid in io_pgtable_cfg instead of the domain

iommu/amd: Store the nid in io_pgtable_cfg instead of the domain

[ Upstream commit 47f218d108950984b24af81f66356ceda380eb74 ]

We already have memory in the union here that is being wasted in AMD's
case, use it to store the nid.

Putting the nid here further isolates the io_pgtable code from the struct
protection_domain.

Fixup protection_domain_alloc so that the NID from the device is provided,
at this point dev is never NULL for AMD so this will now allocate the
first table pointer on the correct NUMA node.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/8-v2-831cdc4d00f3+1a315-amd_iopgtbl_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Stable-dep-of: 016991606aa0 ("iommu/amd/pgtbl_v2: Take protection domain lock before invalidating TLB")
Signed-off-by: Sasha Levin <sashal@kernel.org>