Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/security/apparmor/mount.c b/security/apparmor/mount.c
index c1da224..17081c8 100644
--- a/security/apparmor/mount.c
+++ b/security/apparmor/mount.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * AppArmor security module
  *
@@ -5,16 +6,12 @@
  *
  * Copyright (C) 1998-2008 Novell/SUSE
  * Copyright 2009-2017 Canonical Ltd.
- *
- * 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, version 2 of the
- * License.
  */
 
 #include <linux/fs.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
+#include <uapi/linux/mount.h>
 
 #include "include/apparmor.h"
 #include "include/audit.h"