payloads/seabios: Update stable from 1.11.2 to 1.12.0

SeaBIOS 1.12.0 has been tagged. News are

* Initial support for "TPM CRB" hardware
* Improved cdrom media reporting in the boot menu on QEMU
* Improved floppy support on real floppy hardware
* SeaVGABIOS support for QEMU "bochs-display" and QEMU "ramfb" displays
* Several bug fixes and code cleanups

among others, see http://seabios.org/Releases

Tested by running it on a Thinkpad X230.

Change-Id: I5f8364977ce957d3e8d84d7b046d1cec36b8da6a
Signed-off-by: Martin Kepplinger <martink@posteo.de>
Reviewed-on: https://review.coreboot.org/c/29724
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
diff --git a/payloads/external/SeaBIOS/Kconfig b/payloads/external/SeaBIOS/Kconfig
index fb9f32b..181a9d6 100644
--- a/payloads/external/SeaBIOS/Kconfig
+++ b/payloads/external/SeaBIOS/Kconfig
@@ -5,7 +5,7 @@
 	default SEABIOS_STABLE
 
 config SEABIOS_STABLE
-	bool "1.11.2"
+	bool "1.12.0"
 	help
 	  Stable SeaBIOS version
 config SEABIOS_MASTER
diff --git a/payloads/external/SeaBIOS/Makefile b/payloads/external/SeaBIOS/Makefile
index 4e2ecbd..e505c8c 100644
--- a/payloads/external/SeaBIOS/Makefile
+++ b/payloads/external/SeaBIOS/Makefile
@@ -1,5 +1,5 @@
 TAG-$(CONFIG_SEABIOS_MASTER)=origin/master
-TAG-$(CONFIG_SEABIOS_STABLE)=f9626ccb91e771f990fbb2da92e427a399d7d918
+TAG-$(CONFIG_SEABIOS_STABLE)=a698c8995ffb2838296ec284fe3c4ad33dfca307
 TAG-$(CONFIG_SEABIOS_REVISION)=$(CONFIG_SEABIOS_REVISION_ID)
 
 project_git_repo=https://review.coreboot.org/seabios.git