iommu/sprd: Update to {map,unmap}_pages

Now that the core API has a proper notion of multi-page mappings, clean
up the old pgsize_bitmap hack by implementing the new interfaces
instead. This time we'll get the return values for unmaps correct too.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/9026464e8380b92d10d09103e215eb4306a5df7c.1668100209.git.robin.murphy@arm.com


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