Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
index 90e7899..381593f 100644
--- a/drivers/mfd/dln2.c
+++ b/drivers/mfd/dln2.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Driver for the Diolan DLN-2 USB adapter
  *
@@ -6,10 +7,6 @@
  * Derived from:
  *  i2c-diolan-u2c.c
  *  Copyright (c) 2010-2011 Ericsson AB
- *
- * 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.
  */
 
 #include <linux/kernel.h>