iommu/amd: Rename iommu_flush_all_caches() -> amd_iommu_flush_all_caches()

Rename function inline with driver naming convention.

No functional changes.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20231122090215.6191-2-vasant.hegde@amd.com


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