Merge tag 'arm-smmu-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/will...

Arm SMMU updates for 5.6

- Support for building, and {un,}loading the SMMU drivers as modules

- Minor cleanups

- SMMUv3:
  * Non-critical fix to encoding of TLBI_NH_VA invalidation command
  * Fix broken sanity check on size of MMIO resource during probe
  * Support for Substream IDs which will soon be provided by PCI PASIDs

- io-pgtable:
  * Finish off the TTBR1 preparation work partially merged last cycle
  * Ensure correct memory attributes for non-cacheable mappings

- SMMU:
  * Namespace public #defines to avoid collisions with arch/arm64/
  * Avoid using valid SMR register when probing mask size