Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/firewire/iso-resources.c b/sound/firewire/iso-resources.c
index 066b5df..84f71b2 100644
--- a/sound/firewire/iso-resources.c
+++ b/sound/firewire/iso-resources.c
@@ -1,8 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * isochronous resources helper functions
  *
  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
- * Licensed under the terms of the GNU General Public License, version 2.
  */
 
 #include <linux/device.h>