Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/soc/codecs/ad1836.c b/sound/soc/codecs/ad1836.c
index ada663b..a461525 100644
--- a/sound/soc/codecs/ad1836.c
+++ b/sound/soc/codecs/ad1836.c
@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
  /*
  * Audio Codec driver supporting:
  *  AD1835A, AD1836, AD1837A, AD1838A, AD1839A
  *
  * Copyright 2009-2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
  */
 
 #include <linux/init.h>