moveconfig: Use fd.write() instead of print >>

Adjust this code so that it can work with Python 2 and 3.

Fixes: d73fcb1 (moveconfig: Support building a simple config database)
Reported-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/libfdt/pylibfdt/libfdt.i b/lib/libfdt/pylibfdt/libfdt.i
index 3b11bb0..146f4b9 100644
--- a/lib/libfdt/pylibfdt/libfdt.i
+++ b/lib/libfdt/pylibfdt/libfdt.i
@@ -8,6 +8,8 @@
 
 %module libfdt
 
+%include <stdint.i>
+
 %{
 #define SWIG_FILE_WITH_INIT
 #include "libfdt.h"