Merge tag 'msi-map-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm...

Support for msi-map, and msi-parent update from Marc Zyngier:

- New map-map property to describe the remapping of requester-ids,
  and the routing of MSIs to controllers
- New hooks to make MSI domains per-device if required
- Extension of msi-parent to provide sideband information
- Extensive documentation for both msi-map and msi-parent