iommu/amd: Make amd_iommu_domain_flush_complete() static

iommu/amd: Make amd_iommu_domain_flush_complete() static

AMD driver uses amd_iommu_domain_flush_complete() function to make sure
IOMMU processed invalidation commands before proceeding. Ideally this
should be called from functions which updates DTE/invalidates caches.
There is no need to call this function explicitly. This patches makes
below changes :

- Rename amd_iommu_domain_flush_complete() -> domain_flush_complete()
  and make it as static function.

- Rearrage domain_flush_complete() to avoid forward declaration.

- Update amd_iommu_update_and_flush_device_table() to call
  domain_flush_complete().

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20240828111029.5429-7-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>