usb: gadget: renesas_usbhs: add bus control functions

this patch add DVSTCTR control function for HOST support

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 959af02..040d8bb 100644
--- a/include/linux/usb/renesas_usbhs.h
+++ b/include/linux/usb/renesas_usbhs.h
@@ -82,6 +82,13 @@
 	 * get VBUS status function.
 	 */
 	int (*get_vbus)(struct platform_device *pdev);
+
+	/*
+	 * option:
+	 *
+	 * VBUS control is needed for Host
+	 */
+	int (*set_vbus)(struct platform_device *pdev, int enable);
 };
 
 /*