libfdt: Import libfdt source (1 of 2)

This adds the applicable libfdt source files (unmodified) and a README
to explain where the source came from.
diff --git a/libfdt/README b/libfdt/README
new file mode 100644
index 0000000..f4cca34
--- /dev/null
+++ b/libfdt/README
@@ -0,0 +1,23 @@
+The libfdt functionality was written by David Gibson.  The original
+source came from the git repository:
+
+URL: 		git://ozlabs.org/home/dgibson/git/libfdt.git
+
+author		David Gibson <dgibson@sneetch.(none)>
+		Fri, 23 Mar 2007 04:16:54 +0000 (15:16 +1100)
+committer	David Gibson <dgibson@sneetch.(none)>
+	 	Fri, 23 Mar 2007 04:16:54 +0000 (15:16 +1100)
+commit		857f54e79f74429af20c2b5ecc00ee98af6a3b8b
+tree		2f648f0f88225a51ded452968d28b4402df8ade0
+parent		07a12a08005f3b5cd9337900a6551e450c07b515
+
+To adapt for u-boot usage, only the applicable files were copied and
+imported into the u-boot git repository.
+Omitted:
+* GPL - u-boot comes with a copy of the GPL license
+* test subdirectory - not directly useful for u-boot
+
+After importing, other customizations were performed.  See the git log
+for details.
+
+Jerry Van Baren