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

Update OpenBIOS images

# gpg: Signature made Tue 28 Feb 2017 22:09:11 GMT
# gpg:                using RSA key 0x5BC2C56FAE0F321F
# gpg: Good signature from "Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>"
# Primary key fingerprint: CC62 1AB9 8E82 200D 915C  C9C4 5BC2 C56F AE0F 321F

* remotes/mcayland/tags/qemu-openbios-signed:
  Update OpenBIOS images to 0cd97cc built from submodule.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

openbios @ 0cd97cc9

-Subproject commit ef8a14e8afb47635c9c5f7524a52c3251827e296
+Subproject commit 0cd97cc904e71fbb461112f6756934ec6af890b8