Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/x25/x25_timer.c b/net/x25/x25_timer.c
index fa34610..9376365 100644
--- a/net/x25/x25_timer.c
+++ b/net/x25/x25_timer.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *	X.25 Packet Layer release 002
  *
@@ -7,12 +8,6 @@
  *
  *	This code REQUIRES 2.1.15 or higher
  *
- *	This module:
- *		This module 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.
- *
  *	History
  *	X.25 001	Jonathan Naylor	Started coding.
  *	X.25 002	Jonathan Naylor	New timer architecture.