usb: musb: gadget: use common is_selfpowered

Delete private selfpowered variable, and use common one.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index 2af45a0..10d30af 100644
--- a/drivers/usb/musb/musb_gadget_ep0.c
+++ b/drivers/usb/musb/musb_gadget_ep0.c
@@ -85,7 +85,7 @@
 
 	switch (recip) {
 	case USB_RECIP_DEVICE:
-		result[0] = musb->is_self_powered << USB_DEVICE_SELF_POWERED;
+		result[0] = musb->g.is_selfpowered << USB_DEVICE_SELF_POWERED;
 		result[0] |= musb->may_wakeup << USB_DEVICE_REMOTE_WAKEUP;
 		if (musb->g.is_otg) {
 			result[0] |= musb->g.b_hnp_enable