payloads: Update GRUB stable from 2.02 to 2.04

GRUB 2.04 was released on July 5th, 2019, so update. The only change-log
is the git history. Some coreboot related changes are listed below.

1.  coreboot: Changed cbmemc to support updated console format from
    coreboot.
2.  ahci: Increase time-out from 10 s to 32 s
3.  normal/menu: Do not treat error values as key presses

When building from the git repository, `./bootstrap.sh` needs to be run
to set up Gnulib. Ignore the exit code, as older versions might not have
this script.

Change-Id: Iab0b87164ed86f15d3415af935998b59e0d76c45
Signed-off-by: Pablo <42.pablo.ms@gmail.com>
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34104
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

payloads/external/GRUB2/Kconfig

@@ -5,7 +5,7 @@ choice
 	default GRUB2_STABLE
 
 config GRUB2_STABLE
-	bool "2.02"
+	bool "2.04"
 	help
 	  Stable GRUB2 version
 

payloads/external/GRUB2/Makefile

@@ -1,9 +1,9 @@
 TAG-$(CONFIG_GRUB2_MASTER)=
 TAG-$(CONFIG_GRUB2_REVISION)=$(CONFIG_GRUB2_REVISION_ID)
-TAG-$(CONFIG_GRUB2_STABLE)=e54c99aaff5e5f6f5d3b06028506c57e66d8ef77
+TAG-$(CONFIG_GRUB2_STABLE)=grub-2.04
 NAME-$(CONFIG_GRUB2_MASTER)=HEAD
 NAME-$(CONFIG_GRUB2_REVISION)=$(CONFIG_GRUB2_REVISION_ID)
-NAME-$(CONFIG_GRUB2_STABLE)=2.02
+NAME-$(CONFIG_GRUB2_STABLE)=2.04
 
 project_git_repo=https://git.savannah.gnu.org/git/grub.git/
 project_dir=grub2
@@ -28,7 +28,7 @@ grub2/build/config.h: $(CONFIG_DEP) | checkout
 	echo "    CONFIG     GRUB2 $(NAME-y)"
 	rm -rf grub2/build
 	mkdir grub2/build
-	cd grub2 && ./autogen.sh
+	cd grub2 && ./bootstrap.sh ; ./autogen.sh
 	cd grub2/build && ../configure CC="$(HOSTCC)" LD="$(LD)" \
 	FREETYPE="pkg-config freetype2" BUILD_FREETYPE="pkg-config freetype2" \
 	TARGET_CC="$(CC)" TARGET_OBJCOPY="$(OBJCOPY)" TARGET_STRIP="$(STRIP)" \