iommu/amd: Make domain_flush_pages as global function

iommu/amd: Make domain_flush_pages as global function

- Rename domain_flush_pages() -> amd_iommu_domain_flush_pages() and make
  it as global function.

- Rename amd_iommu_domain_flush_tlb_pde() -> amd_iommu_domain_flush_all()
  and make it as static.

- Convert v1 page table (io_pgtble.c) to use amd_iommu_domain_flush_pages().

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20231122090215.6191-9-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>