Merge remote-tracking branch 'remotes/mcayland/tags/qemu-openbios-20210316' into staging

qemu-openbios queue

# gpg: Signature made Tue 16 Mar 2021 20:36:15 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-20210316:
  Update OpenBIOS images to 4a004110 built from submodule.

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

openbios @ 4a004110

-Subproject commit 7f28286f5cb1ca682e3ba0a8706d8884f12bc49e
+Subproject commit 4a0041107b8ef77e0e8337bfcb5f8078887261a7