usb: gadget: renesas_usbhs: change usbhsc_bus_ctrl() to usbsc_set_buswait()

renesas_usbhs will have register DVSTCTR control function for HOST support.
This patch changes usbhsc_bus_ctrl() to usbsc_set_buswait(),
to remove DVSTCTR access from it,

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/include/linux/usb/renesas_usbhs.h b/include/linux/usb/renesas_usbhs.h
index 8977431..959af02 100644
--- a/include/linux/usb/renesas_usbhs.h
+++ b/include/linux/usb/renesas_usbhs.h
@@ -101,6 +101,8 @@
 	 * option:
 	 *
 	 * for BUSWAIT :: BWAIT
+	 * see
+	 *	renesas_usbhs/common.c :: usbhsc_set_buswait()
 	 * */
 	int buswait_bwait;