iommu/exynos: 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/579176033e92d49ec9fc9f3d33d7b9d4c474f0b4.1694525662.git.robin.murphy@arm.com


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