Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/phy/mdio-octeon.c b/drivers/net/phy/mdio-octeon.c
index ab6914f..8327382 100644
--- a/drivers/net/phy/mdio-octeon.c
+++ b/drivers/net/phy/mdio-octeon.c
@@ -1,8 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
  * Copyright (C) 2009-2015 Cavium, Inc.
  */
 
@@ -122,4 +119,4 @@
 
 MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
 MODULE_AUTHOR("David Daney");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");