Merge remote-tracking branch 'remotes/afaerber/tags/maintainers-for-peter' into staging

Andreas stepping down from most maintainer positions

# gpg: Signature made Wed 25 May 2016 16:53:45 BST using RSA key ID 3E7E013F
# gpg: Good signature from "Andreas Färber <afaerber@suse.de>"
# gpg:                 aka "Andreas Färber <afaerber@suse.com>"

* remotes/afaerber/tags/maintainers-for-peter:
  MAINTAINERS: Drop Andreas as CPU maintainer
  MAINTAINERS: Drop Andreas as 0.15 maintainer
  MAINTAINERS: Drop Andreas as PReP maintainer
  MAINTAINERS: Drop Andreas as Cocoa maintainer

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