Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/phy/mdio-i2c.h b/drivers/net/phy/mdio-i2c.h
index 889ab57..751dab2 100644
--- a/drivers/net/phy/mdio-i2c.h
+++ b/drivers/net/phy/mdio-i2c.h
@@ -1,11 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * MDIO I2C bridge
  *
  * Copyright (C) 2015 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 #ifndef MDIO_I2C_H
 #define MDIO_I2C_H