Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/input/serio/serio_raw.c b/drivers/input/serio/serio_raw.c
index 17b7fbe..e9647eb 100644
--- a/drivers/input/serio/serio_raw.c
+++ b/drivers/input/serio/serio_raw.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Raw serio device providing access to a raw byte stream from underlying
  * serio port. Closely emulates behavior of pre-2.6 /dev/psaux device
  *
  * Copyright (c) 2004 Dmitry Torokhov
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
  */
 
 #include <linux/kref.h>