net: phy: Fixup GPLv2 SPDX tags based on license text

A few PHY drivers have the GPLv2 license text. They then either have
a MODULE_LICENSE() of GPLv2+, or an SPDX tag of GPLv2+.

Since the license text is much easier to understand than either the
SPDX tag or the MODULE_LICENSE, use it as the definitive source of the
licence, and fixup with others when there are contradictions.

Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Jonas Jensen <jonas.jensen@gmail.com>
Cc: Laurent Pinchart <laurentp@cse-semaphore.com>
Cc: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
Cc: Scott Wood <scottwood@freescale.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Andrew F. Davis <afd@ti.com>
Acked-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/dp83822.c

@@ -1,16 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Driver for the Texas Instruments DP83822 PHY
  *
  * Copyright (C) 2017 Texas Instruments Inc.
- *
- * 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; either version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/ethtool.h>
@@ -338,4 +330,4 @@ MODULE_DEVICE_TABLE(mdio, dp83822_tbl);
 
 MODULE_DESCRIPTION("Texas Instruments DP83822 PHY driver");
 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");