usb: gadget: atmel_usba_udc: Fixed vbus_prev initial state

If vbus gpio is high at init, we should set vbus_prev to true
accordingly to the current vbus state. Without that, we skip the first
vbus interrupt because the saved vbus state is not consistent.
Signed-off-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/udc/atmel_usba_udc.c

@@ -1811,6 +1811,8 @@ static int atmel_usba_start(struct usb_gadget *gadget,
 		toggle_bias(udc, 1);
 		usba_writel(udc, CTRL, USBA_ENABLE_MASK);
 		usba_int_enb_set(udc, USBA_END_OF_RESET);
+
+		udc->vbus_prev = 1;
 	}
 	spin_unlock_irqrestore(&udc->lock, flags);