iommu/amd: Remove unused IOVA_* macro

iommu/amd: Remove unused IOVA_* macro

These macros are not used after commit ac6d704679d343 ("iommu/dma: Pass
address limit rather than size to iommu_setup_dma_ops()").

No functional change intended.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Cc: Lu Baolu <baolu.lu@linux.intel.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/20240118090105.5864-3-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>