Merge remote-tracking branch 'remotes/kraxel/tags/seabios-20200803-pull-request'...

seabios: update to master snapshot

seabios master branch got a few bugfixes, so update
to a newer snapshot to pick them up for 5.1-rc3.

# gpg: Signature made Mon 03 Aug 2020 06:24:17 BST
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/seabios-20200803-pull-request:
  seabios: update to master snapshot

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