Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/soc/sirf/sirf-audio-port.c b/sound/soc/sirf/sirf-audio-port.c
index be066de..8be2f0b 100644
--- a/sound/soc/sirf/sirf-audio-port.c
+++ b/sound/soc/sirf/sirf-audio-port.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SiRF Audio port driver
  *
  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
- *
- * Licensed under GPLv2 or later.
  */
 #include <linux/module.h>
 #include <sound/soc.h>