Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/phy/mdio-cavium.c b/drivers/net/phy/mdio-cavium.c
index 6df2fa7..1afd6fc 100644
--- a/drivers/net/phy/mdio-cavium.c
+++ b/drivers/net/phy/mdio-cavium.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) 2009-2016 Cavium, Inc.
  */
 
@@ -150,4 +147,4 @@
 
 MODULE_DESCRIPTION("Common code for OCTEON and Thunder MDIO bus drivers");
 MODULE_AUTHOR("David Daney");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");