Move libfdt/ into lib/

Move the libfdt directory into the common lib/ directory to clean up the
top-level directory.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/Makefile b/Makefile
index 0b70dca..fdd781a 100644
--- a/Makefile
+++ b/Makefile
@@ -244,7 +244,7 @@
 LIBS += drivers/video/libvideo.a
 LIBS += drivers/watchdog/libwatchdog.a
 LIBS += common/libcommon.a
-LIBS += libfdt/libfdt.a
+LIBS += lib/libfdt/libfdt.a
 LIBS += api/libapi.a
 LIBS += post/libpost.a