Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/soc/rockchip/rockchip_spdif.c b/sound/soc/rockchip/rockchip_spdif.c
index a89fe9b..6635145 100644
--- a/sound/soc/rockchip/rockchip_spdif.c
+++ b/sound/soc/rockchip/rockchip_spdif.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* sound/soc/rockchip/rk_spdif.c
  *
  * ALSA SoC Audio Layer - Rockchip I2S Controller driver
@@ -6,10 +7,6 @@
  * Author: Jianqun <jay.xu@rock-chips.com>
  * Copyright (c) 2015 Collabora Ltd.
  * Author: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
- *
- * 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.
  */
 
 #include <linux/module.h>