iommu/io-pgtable-arm: Remove map/unmap

With all users now calling {map,unmap}_pages, remove the wrappers.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/162e58e83ed42f78c3fbefe78c9b5410dd1dc412.1668100209.git.robin.murphy@arm.com


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