Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/mcb/Kconfig b/drivers/mcb/Kconfig
index 76d9c51..0a88348 100644
--- a/drivers/mcb/Kconfig
+++ b/drivers/mcb/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # MEN Chameleon Bus (MCB) support
 #
diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c
index bb5c569..b72e82e 100644
--- a/drivers/mcb/mcb-core.c
+++ b/drivers/mcb/mcb-core.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * MEN Chameleon Bus.
  *
  * Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de)
  * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; version 2 of the License.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
diff --git a/drivers/mcb/mcb-lpc.c b/drivers/mcb/mcb-lpc.c
index 945091a..8f1bde4 100644
--- a/drivers/mcb/mcb-lpc.c
+++ b/drivers/mcb/mcb-lpc.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * MEN Chameleon Bus.
  *
  * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
  * Author: Andreas Werner <andreas.werner@men.de>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; version 2 of the License.
  */
 
 #include <linux/platform_device.h>
diff --git a/drivers/mcb/mcb-parse.c b/drivers/mcb/mcb-parse.c
index 7369bda..3b69e6a 100644
--- a/drivers/mcb/mcb-parse.c
+++ b/drivers/mcb/mcb-parse.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/types.h>
 #include <linux/ioport.h>
 #include <linux/slab.h>
diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c
index c2d69e3..14866aa 100644
--- a/drivers/mcb/mcb-pci.c
+++ b/drivers/mcb/mcb-pci.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * MEN Chameleon Bus.
  *
  * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
  * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; version 2 of the License.
  */
 
 #include <linux/module.h>