USB: renesas_usbhs: rcar?.h: add SPDX tags

These files somehow never got an SPDX tag added to them, maybe due to
the small size.  So provide the default identifier of the whole project:
	SPDX-License-Identifier: GPL-2.0

The SPDX identifier is a legally binding shorthand, which can be used
instead of the full boiler plate text.

Cc: Rob Herring <robh@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Acked-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/renesas_usbhs/rcar2.h

+// SPDX-License-Identifier: GPL-2.0
 #include "common.h"
 
 extern const struct renesas_usbhs_platform_callback

drivers/usb/renesas_usbhs/rcar3.h

+// SPDX-License-Identifier: GPL-2.0
 #include "common.h"
 
 extern const struct renesas_usbhs_platform_callback usbhs_rcar3_ops;