Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/crypto/dh_helper.c b/crypto/dh_helper.c
index edacda5..9fd5a42 100644
--- a/crypto/dh_helper.c
+++ b/crypto/dh_helper.c
@@ -1,11 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (c) 2016, Intel Corporation
  * Authors: Salvatore Benedetto <salvatore.benedetto@intel.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/kernel.h>
 #include <linux/export.h>