Merge remote-tracking branch 'remotes/jnsnow/tags/ide-pull-request' into staging

# gpg: Signature made Thu 29 Sep 2016 21:13:46 BST
# gpg:                using RSA key 0x7DEF8106AAFC390E
# gpg: Good signature from "John Snow (John Huston) <jsnow@redhat.com>"
# Primary key fingerprint: FAEB 9711 A12C F475 812F  18F2 88A9 064D 1835 61EB
#      Subkey fingerprint: F9B7 ABDB BCAC DF95 BE76  CBD0 7DEF 8106 AAFC 390E

* remotes/jnsnow/tags/ide-pull-request:
  ide: Fix memory leak in ide_register_restart_cb()
  MAINTAINERS: Add some more headers to the IDE section
  ahci: clear aiocb in ncq_cb
  ide: fix DMA register transitions

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>