Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/security/keys/permission.c b/security/keys/permission.c
index f68dc04..085f907 100644
--- a/security/keys/permission.c
+++ b/security/keys/permission.c
@@ -1,15 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Key permission checking
  *
  * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
  */
 
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/security.h>
 #include "internal.h"