usb: renesas_usbhs: fixup driver speed

This patch cares latest USB_SPEED_SUPER support.
renesas_usbhs can not use super-speed, but can use full/high speed.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>