Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/sound/rt5659.h b/include/sound/rt5659.h
index 9012e2b..d495311 100644
--- a/include/sound/rt5659.h
+++ b/include/sound/rt5659.h
@@ -1,11 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * linux/sound/rt5659.h -- Platform data for RT5659
  *
  * Copyright 2013 Realtek Microelectronics
- *
- * 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.
  */
 
 #ifndef __LINUX_SND_RT5659_H