Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/gameport.h b/include/linux/gameport.h
index bb7de09..69081d8 100644
--- a/include/linux/gameport.h
+++ b/include/linux/gameport.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 _GAMEPORT_H
 #define _GAMEPORT_H