Merge remote-tracking branch 'remotes/mcayland/tags/qemu-openbios-signed' into staging

Update OpenBIOS images

# gpg: Signature made Fri 26 Feb 2016 10:45:04 GMT using RSA key ID AE0F321F
# gpg: Good signature from "Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>"

* remotes/mcayland/tags/qemu-openbios-signed:
  Update OpenBIOS images
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

openbios @ 0dbda5d9

-Subproject commit bd95e4c193905d5ed867e96f1a720ce4cb53b59f
+Subproject commit 0dbda5d935f95391d16431cd3c079fbf53d668df