payloads/seabios: Update stable from 1.11.1 to 1.11.2

SeaBIOS 1.11.2 was tagged with the following changes:

```
f9626cc cbvga_set_mode: refine clear display logic
f88297a qemu: add qemu ramfb support
a2e4001 vgasrc: add allocate_pmm()
17b01f4 pmm: use tmp zone on oom
44b17d0 bochs_display_setup: return error on failure
4ba61fa cbvga_set_mode: disable clearmem in windows x86 emulator.
dd69189 cbvga_list_modes: don't list current mode twice
5f0e7c9 cbvga_setup_modes: use real mode number instead of 0x140
961f67c qemu: add bochs-display support
767365e cbvga: factor out cbvga_setup_modes()
7906460 optionrom: enable non-vga display devices
```

Tested by running it on a Thinkpad X230.

Change-Id: Iea13eb64b3d5af0b283bff096587a3039227b5c0
Signed-off-by: Martin Kepplinger <martink@posteo.de>
Tested-by: Martin Kepplinger <martink@posteo.de>
Reviewed-on: https://review.coreboot.org/27326
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/payloads/external/SeaBIOS/Kconfig b/payloads/external/SeaBIOS/Kconfig
index 63f91d6..52dc738 100644
--- a/payloads/external/SeaBIOS/Kconfig
+++ b/payloads/external/SeaBIOS/Kconfig
@@ -5,7 +5,7 @@
 	default SEABIOS_STABLE
 
 config SEABIOS_STABLE
-	bool "1.11.1"
+	bool "1.11.2"
 	help
 	  Stable SeaBIOS version
 config SEABIOS_MASTER
diff --git a/payloads/external/SeaBIOS/Makefile b/payloads/external/SeaBIOS/Makefile
index 7058a8d..4e2ecbd 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)=0551a4be2ce599fb60e478b4c15e06ab6587822c
+TAG-$(CONFIG_SEABIOS_STABLE)=f9626ccb91e771f990fbb2da92e427a399d7d918
 TAG-$(CONFIG_SEABIOS_REVISION)=$(CONFIG_SEABIOS_REVISION_ID)
 
 project_git_repo=https://review.coreboot.org/seabios.git