Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/regulator/ad5398.c b/drivers/regulator/ad5398.c
index 11c1f88..75f432f 100644
--- a/drivers/regulator/ad5398.c
+++ b/drivers/regulator/ad5398.c
@@ -1,11 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Voltage and current regulation for AD5398 and AD5821
  *
  * Copyright 2010 Analog Devices Inc.
  *
  * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
  */
 
 #include <linux/module.h>