qiommu/arm-smmu-v3: Remove iommu_ops pgsize_bitmap

qiommu/arm-smmu-v3: Remove iommu_ops pgsize_bitmap

The driver never reads this value, arm_smmu_domain_finalise() always sets
domain.pgsize_bitmap to pgtbl_cfg, which comes from the per-smmu
calculated value.

Remove the ops version entirely, the related dead code and make
arm_smmu_ops const.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/1-v2-68a2e1ba507c+1fb-iommu_rm_ops_pgsize_jgg@nvidia.com
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>