seabios update for 4.0

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Merge remote-tracking branch 'remotes/kraxel/tags/seabios-1.12.1-20190318-pull-request' into staging

seabios update for 4.0

# gpg: Signature made Mon 18 Mar 2019 13:07:53 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-1.12.1-20190318-pull-request:
  seabios: update binaries to 1.12.1
  seabios: turn off CONFIG_ATA_DMA
  seabios: update submodule to 1.12.1

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

roms/config.seabios-128k

@@ -2,7 +2,7 @@
 # need to turn off features (xhci,uas) to make it fit into 128k
 CONFIG_QEMU=y
 CONFIG_ROM_SIZE=128
-CONFIG_ATA_DMA=y
+CONFIG_ATA_DMA=n
 CONFIG_BOOTSPLASH=n
 CONFIG_XEN=n
 CONFIG_USB_OHCI=n

roms/config.seabios-256k

@@ -1,4 +1,4 @@
 # for qemu machine types 2.0 + newer
 CONFIG_QEMU=y
 CONFIG_ROM_SIZE=256
-CONFIG_ATA_DMA=y
+CONFIG_ATA_DMA=n

roms/seabios

@@ -1 +1 @@
-Subproject commit a698c8995ffb2838296ec284fe3c4ad33dfca307
+Subproject commit a5cab58e9a3fb6e168aba919c5669bea406573b4