iommu/amd: Remove PPR support

Remove PPR handler and notifier related functions as its not used
anymore. Note that we are retaining PPR interrupt handler support
as it will be re-used when we introduce IOPF support.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Tested-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20231006095706.5694-3-vasant.hegde@amd.com


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