update seabios to 1.7.5.1 stable release

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Merge remote-tracking branch 'remotes/kraxel/tags/pull-seabios-1.7.5.1-20141113-1' into staging

update seabios to 1.7.5.1 stable release

# gpg: Signature made Thu 13 Nov 2014 11:03:05 GMT using RSA key ID D3E87138
# 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>"

* remotes/kraxel/tags/pull-seabios-1.7.5.1-20141113-1:
  update seabios to 1.7.5.1 stable release

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

roms/seabios

@@ -1 +1 @@
-Subproject commit e51488c5f8800a52ac5c8da7a31b85cca5cc95d2
+Subproject commit 8936dbb2cd5403c9a8279c849f7f4b0ccc0796ac