Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/serio.h b/include/linux/serio.h
index 138a5ef..6c27d41 100644
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -1,9 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (C) 1999-2002 Vojtech Pavlik
-*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
  */
 #ifndef _SERIO_H
 #define _SERIO_H