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 only, or an SPDX tag of GPLv2 only.

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 the others when there are contradictions.

Cc: David Wu <[e-mail]>
Cc: Dongpo Li <[e-mail]>
Cc: Michael Schmitz <[e-mail]>
Signed-off-by: Andrew Lunn <[e-mail]>
Acked-by: Michael Schmitz <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/phy/asix.c

···
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0+
 /* Driver for Asix PHYs
  *
  * Author: Michael Schmitz <[e-mail]>
- *
- * 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, or (at your
- * option) any later version.
- *
  */
 #include <linux/kernel.h>
 #include <linux/errno.h>

drivers/net/phy/mdio-hisi-femac.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Hisilicon Fast Ethernet MDIO Bus Driver
  *
  * Copyright (c) 2016 HiSilicon Technologies Co., Ltd.
- *
- * 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, or
- * (at your option) any later version.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <linux/clk.h>
···
 
 MODULE_DESCRIPTION("Hisilicon Fast Ethernet MAC MDIO interface driver");
 MODULE_AUTHOR("Dongpo Li <[e-mail]>");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");

drivers/net/phy/rockchip.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /**
  * drivers/net/phy/rockchip.c
  *
···
  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
  *
  * David Wu <[e-mail]>
- *
- * 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, or
- * (at your option) any later version.
- *
  */
 
 #include <linux/ethtool.h>
···
 
 MODULE_AUTHOR("David Wu <[e-mail]>");
 MODULE_DESCRIPTION("Rockchip Ethernet PHY driver");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");