Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu...

Pull mailbox updates from Jussi Brar:
 "Broadcom:
   - New PDC controller driver and bindings

  Misc:
   - PL320 - Convert from 'raw' IO to 'relaxed' version
   - Test - fix dangling pointer"

* 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: Fix format and type mismatches in Broadcom PDC driver
  mailbox: Add Broadcom PDC mailbox driver
  dt-bindings: add bindings documentation for PDC driver.
  mailbox: pl320: remove __raw IO
  mailbox: mailbox-test: set tdev->signal to NULL after freeing