phy: renesas: use SPDX identifier for Renesas drivers

Use SPDX identifier for Renesas drivers.

Signed-off-by: Wolfram Sang <[e-mail]>
Acked-by: Yoshihiro Shimoda <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/renesas/phy-rcar-gen2.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Renesas R-Car Gen2 PHY driver
  *
  * Copyright (C) 2014 Renesas Solutions Corp.
  * Copyright (C) 2014 Cogent Embedded, Inc.
- *
- * 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.
  */
 
 #include <linux/clk.h>

drivers/phy/renesas/phy-rcar-gen3-usb2.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Renesas R-Car Gen3 for USB2.0 PHY driver
  *
···
  * This is based on the phy-rcar-gen2 driver:
  * Copyright (C) 2014 Renesas Solutions Corp.
  * Copyright (C) 2014 Cogent Embedded, Inc.
- *
- * 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.
  */
 
 #include <linux/extcon-provider.h>

drivers/phy/renesas/phy-rcar-gen3-usb3.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Renesas R-Car Gen3 for USB3.0 PHY driver
  *
  * Copyright (C) 2017 Renesas Electronics Corporation
- *
- * 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.
  */
 
 #include <linux/clk.h>