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

Trivially update map/unmap to the new interface, which is quite happy
for drivers to still process just one page per call.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/7bad94ffccd4cba32bded72e0860974012881e24.1694525662.git.robin.murphy@arm.com


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