iommu/amd: Remove unused PPR_* macros

iommu/amd: Remove unused PPR_* macros

Commit 5a0b11a180a ("iommu/amd: Remove iommu_v2 module") missed to
remove PPR_* macros. Remove these macros as its not used anymore.

No functional change intended.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240118090105.5864-2-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>