usb: composite: fix usb_function_activate/deactivate functions

Using usb_gadget_disconnect to make gadget temporarily invisible to host
doesn't provide desired result, because gadget is connected immediately
after binding regardless to previous usb_gadget_disconnect() calls.

For this reason we use usb_gadget_deactivate() instead of
usb_gadget_disconnect() to make it working as expected.

Signed-off-by: Robert Baldyga <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/gadget/composite.c

···
 	spin_lock_irqsave(&cdev->lock, flags);
 
 	if (cdev->deactivations == 0)
-		status = usb_gadget_disconnect(cdev->gadget);
+		status = usb_gadget_deactivate(cdev->gadget);
 	if (status == 0)
 		cdev->deactivations++;
 
···
 	else {
 		cdev->deactivations--;
 		if (cdev->deactivations == 0)
-			status = usb_gadget_connect(cdev->gadget);
+			status = usb_gadget_activate(cdev->gadget);
 	}
 
 	spin_unlock_irqrestore(&cdev->lock, flags);