libpayload: reduce libcbfs verbosity

Prettier in real-world payloads (ie. FILO)

Change-Id: I9ed968fe527c5d46090e707e2d89b7406a43662e
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/3887
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

payloads/libpayload/libcbfs/cbfs.c

@@ -49,7 +49,7 @@
 #ifdef LIBPAYLOAD
 # include <stdio.h>
 # define DEBUG(x...)
-# define LOG(x...) printf(x)
+# define LOG(x...)
 # define ERROR(x...) printf(x)
 #else
 # include <console/console.h>