lib/libfdt/: General aesthetic/style fixes.

A number of style fixes across the files in this directory, including:

 * Correct invalid kernel-doc content.
 * Tidy up massive comment in fdt_region.c.
 * Use correct spelling of "U-Boot".
 * Replace tests of "! <var>" with "!<var>".
 * Replace "libfdt_env.h" with <libfdt_env.h>.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/libfdt/README b/lib/libfdt/README
index e059876..db40ab2 100644
--- a/lib/libfdt/README
+++ b/lib/libfdt/README
@@ -1,5 +1,5 @@
 The libfdt functionality was written by David Gibson.  The original
-source came from the git repository:
+source came from the Git repository:
 
 URL:		git://ozlabs.org/home/dgibson/git/libfdt.git
 
@@ -11,13 +11,15 @@
 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
+To adapt for U-Boot usage, only the applicable files were copied and
+imported into the U-Boot Git repository.
 
-After importing, other customizations were performed.  See the git log
-for details.
+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