Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/soc/codecs/pcm3168a.h b/sound/soc/codecs/pcm3168a.h
index 56c8332..c4b7140 100644
--- a/sound/soc/codecs/pcm3168a.h
+++ b/sound/soc/codecs/pcm3168a.h
@@ -1,13 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * PCM3168A codec driver header
  *
  * Copyright (C) 2015 Imagination Technologies Ltd.
  *
  * Author: Damien Horsley <Damien.Horsley@imgtec.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
  */
 
 #ifndef __PCM3168A_H__