seabios: update to 1.13.0 final

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Merge remote-tracking branch 'remotes/kraxel/tags/seabios-20191220-pull-request' into staging

seabios: update to 1.13.0 final

# gpg: Signature made Fri 20 Dec 2019 06:07:53 GMT
# 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-20191220-pull-request:
  seabios: update to 1.13.0 final

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

roms/config.seabios-128k

@@ -15,3 +15,4 @@ CONFIG_PVSCSI=n
 CONFIG_NVME=n
 CONFIG_USE_SMM=n
 CONFIG_VGAHOOKS=n
+CONFIG_HOST_BIOS_GEOMETRY=n

roms/seabios

@@ -1 +1 @@
-Subproject commit c9ba5276e3217ac6a1ec772dbebf568ba3a8a55d
+Subproject commit f21b5a4aeb020f2a5e2c6503f906a9349dd2f069