usb: dwc3: gadget: don't touch gadget.dev.driver

udc-core now handles that for us, which means
we can remove it from our driver.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/dwc3/gadget.c

@@ -1519,7 +1519,6 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 	}
 
 	dwc->gadget_driver	= driver;
-	dwc->gadget.dev.driver	= &driver->driver;
 
 	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
 	reg &= ~(DWC3_DCFG_SPEED_MASK);
@@ -1607,7 +1606,6 @@ static int dwc3_gadget_stop(struct usb_gadget *g,
 	__dwc3_gadget_ep_disable(dwc->eps[1]);
 
 	dwc->gadget_driver	= NULL;
-	dwc->gadget.dev.driver	= NULL;
 
 	spin_unlock_irqrestore(&dwc->lock, flags);