Merge remote-tracking branch 'remotes/mcayland/tags/qemu-openbios-20190215' into staging

qemu-openbios queue

# gpg: Signature made Fri 15 Feb 2019 10:31:11 GMT
# gpg:                using RSA key CC621AB98E82200D915CC9C45BC2C56FAE0F321F
# gpg:                issuer "mark.cave-ayland@ilande.co.uk"
# gpg: Good signature from "Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>" [full]
# Primary key fingerprint: CC62 1AB9 8E82 200D 915C  C9C4 5BC2 C56F AE0F 321F

* remotes/mcayland/tags/qemu-openbios-20190215:
  Update OpenBIOS images to 3464681b built from submodule.

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

openbios @ 3464681b

-Subproject commit 441a84d3a642a10b948369c63f32367e8ff6395b
+Subproject commit 3464681b2b5983df80086a40179d324102347da3