smdk6400: add gitignore

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/samsung/smdk6400/.gitignore b/board/samsung/smdk6400/.gitignore
new file mode 100644
index 0000000..25ab492
--- /dev/null
+++ b/board/samsung/smdk6400/.gitignore
@@ -0,0 +1,5 @@
+#
+# Generated files
+#
+
+/config.tmp