Makefile: Fix whitespace and syntax highlighting nits

Change-Id: Id16ec035f4468f122f4ef3d5f6385252e428a0fc
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/18783
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed