libpayload: make searching for a file less verbose

The cbfs core code would print out all unmatched file
names when searching for a file. This contributes to a lot
of unnecessary messages in the boot log. Change this
message to a DEBUG one so that it will only be printed when
CONFIG_DEBUG_CBFS is enabled.

Change-Id: I34c747e0d3406351318abf70994dbc0bb3fa6c01
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/3164
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Tested-by: build bot (Jenkins)
diff --git a/payloads/libpayload/libcbfs/cbfs_core.c b/payloads/libpayload/libcbfs/cbfs_core.c
index a714b91..3fe6971 100644
--- a/payloads/libpayload/libcbfs/cbfs_core.c
+++ b/payloads/libpayload/libcbfs/cbfs_core.c
@@ -158,7 +158,8 @@
 			media->close(media);
 			return file_ptr;
 		} else {
-			LOG(" (unmatched file @0x%x: %s)\n", offset, file_name);
+			DEBUG(" (unmatched file @0x%x: %s)\n", offset,
+			      file_name);
 			media->unmap(media, file_name);
 		}