Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/lib/raid6/mktables.c b/lib/raid6/mktables.c
index e824d08..9c485df 100644
--- a/lib/raid6/mktables.c
+++ b/lib/raid6/mktables.c
@@ -1,11 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* -*- linux-c -*- ------------------------------------------------------- *
  *
  *   Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
  *
- *   This file is part of the Linux kernel, and is made available under
- *   the terms of the GNU General Public License version 2 or (at your
- *   option) any later version; incorporated herein by reference.
- *
  * ----------------------------------------------------------------------- */
 
 /*