Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/clocksource/dw_apb_timer.c b/drivers/clocksource/dw_apb_timer.c
index 1f5f734..6547665 100644
--- a/drivers/clocksource/dw_apb_timer.c
+++ b/drivers/clocksource/dw_apb_timer.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * (C) Copyright 2009 Intel Corporation
  * Author: Jacob Pan (jacob.jun.pan@intel.com)
  *
  * Shared with ARM platforms, Jamie Iles, Picochip 2011
  *
- * 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.
- *
  * Support for the Synopsys DesignWare APB Timers.
  */
 #include <linux/dw_apb_timer.h>