blobutil: merge with main script

make blobutil a symlink. Example of command changes:

./blobutil download x220_8mb
is now:
./update blobs download x220_8mb

The old command still works, for compatibility.

Signed-off-by: Leah Rowe <leah@libreboot.org>

lbmk

@@ -34,7 +34,11 @@ main()
 	if [ "${0##*/}" = "lbmk" ]; then
 		die "Do not run the lbmk script directly!"
 	elif [ "${0##*/}" = "download" ]; then
-		./update module $@
+		./update module $@ || exit 1
+		exit 0
+	elif [ "${0##*/}" = "blobutil" ]; then
+		./update blobs $@ || exit 1
+		exit 0
 	elif [ $# -lt 2 ]; then
 		die "Too few arguments. Try: ${0} help"
 	fi