iommu/msm: Hook up iotlb_sync_map

The core API can now accommodate invalidate-on-map style behaviour in a
single efficient call, so hook that up instead of having io-pgatble do
it piecemeal.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/e95223a0abf129230a0bec6743f837075f0a2fcb.1611764372.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>