libfdt: Replace v1.4.1 by v1.4.2

Delete old version of libfdt at lib/libfdt. Move new libfdt API
headers to include/lib/libfdt and all other files to lib/libfdt.

Change-Id: I32b7888f1f20d62205310e363accbef169ad7b1b
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/include/lib/libfdt/fdt.h b/include/lib/libfdt/fdt.h
index 6331998..c833dc1 100644
--- a/include/lib/libfdt/fdt.h
+++ b/include/lib/libfdt/fdt.h
@@ -53,7 +53,7 @@
  */
 
 /*
- * Portions copyright (c) 2016, ARM Limited and Contributors.
+ * Portions copyright (c) 2016-2017, ARM Limited and Contributors.
  * All rights reserved.
  */