Merge remote-tracking branch 'remotes/mcayland/tags/qemu-openbios-20200727' into staging

qemu-openbios queue

# gpg: Signature made Mon 27 Jul 2020 16:09:34 BST
# 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-20200727:
  Update OpenBIOS images to 7f28286f built from submodule.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

openbios @ 7f28286f

-Subproject commit 75fbb41d2857d93208c74a8e0228b29fd7bf04c0
+Subproject commit 7f28286f5cb1ca682e3ba0a8706d8884f12bc49e