iommu/arm-smmu: Mask TLBI address correctly

The less said about "~12UL" the better. Oh dear.

We get away with it due to calling constraints that mean IOVAs are
implicitly at least page-aligned to begin with, but still; oh dear.

Change-Id: I8e4ed0ccc1aae76988449895e6f7a9944d429af6
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Git-commit: 353b3250
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>