A small pull request consisting of:

- Make rpmsg process all pending messages instead of just
  one, from Robert Tivy
- Fix Kconfig dependency on VIRTUALIZATION, from Suman.
  Note: this was submitted late during the 3.9 rc cycle and it
  seemed appropriate to wait with it for the merge window.
- Belated addition of an rpmsg entry to the MAINTAINERS file.
  People seem to look for this.
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