re-add grub backgrounds and update grub. mitigate missing characters

mitigate missing characters in unifont for border/arrow characters. this saves
space because now it is no longer necessary to add a custom font

the background added has the libreboot logo on it, and it's 10kb in size unlike
the old gnulove background that was hundreds of KB

resources/scripts/build/boot/roms_helper

@@ -347,6 +347,14 @@ make_grubrom_from_keymap() {
 	"${cbfstool_path}" "${tmprom}" add -f "${grubcfg}" -n grub.cfg -t raw
 	"${cbfstool_path}" "${tmprom}" add -f "${grubtestcfg}" -n grubtest.cfg -t raw
 
+	backgroundfile="background1280x800.png"
+	if [ "${board}" = "x60" ] || [ "${board}" = "t60_intelgpu" ]; then
+		# TODO: don't hardcode this check. do it in board.cfg per board
+		backgroundfile="background1024x768.png"
+	fi
+	backgroundfile="resources/grub/background/${backgroundfile}"
+	"${cbfstool_path}" "${tmprom}" add -f ${backgroundfile} -n background.png -t raw
+
 	printf "%s\n" "${tmprom}"
 }
 

resources/scripts/download/grub

@@ -43,7 +43,10 @@ fi
 # modifications are required
 cd "grub/"
 # reset to known revision
-git reset --hard c0e647eb0e2bd09315612446cb4d90f7f75cb44c
+git reset --hard 50aace6bdb918150ba47e3c16146dcca271c134a
+for grubpatch in ../resources/grub/patches/*; do
+	git am "${grubpatch}"
+done
 
 git clone git://git.sv.gnu.org/gnulib gnulib
 cd gnulib/