update seabios to 1.11.1

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Merge remote-tracking branch 'remotes/kraxel/tags/seabios-1.11.1-20180319-pull-request' into staging

update seabios to 1.11.1

# gpg: Signature made Mon 19 Mar 2018 10:26:35 GMT
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/seabios-1.11.1-20180319-pull-request:
  update seabios to 1.11.1

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

roms/seabios

@@ -1 +1 @@
-Subproject commit 63451fca13c75870e1703eb3e20584d91179aebc
+Subproject commit 0551a4be2ce599fb60e478b4c15e06ab6587822c