iommu/ipmmu-vmsa: Minor cleanups

Remove the of_match_ptr() which was supposed to have gone long ago, but
managed to got lost in a fix-squashing mishap. On a similar theme, we
may as well also modernise the PM ops to get rid of the clunky #ifdefs,
and modernise the resource mapping to keep the checkpatch brigade happy.

Link: https://lore.kernel.org/linux-iommu/Yxni3d6CdI3FZ5D+@8bytes.org/


Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/791877b0d310dc2ab7dc616d2786ab24252b9b8e.1707151207.git.robin.murphy@arm.com


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