Fix copyright header on padding.h.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/570038
diff --git a/include/padding.h b/include/padding.h
index ffda2c4..938cec2 100644
--- a/include/padding.h
+++ b/include/padding.h
@@ -1,3 +1,8 @@
+/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
 #ifndef VBOOT_REFERENCE_PADDING_H_
 #define VBOOT_REFERENCE_PADDING_H_