usb: gadget: dummy_hcd: 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/gadget/dummy_hcd.c

@@ -912,7 +912,6 @@ static int dummy_udc_start(struct usb_gadget *g,
 	dum->devstatus = 0;
 
 	dum->driver = driver;
-	dum->gadget.dev.driver = &driver->driver;
 	dev_dbg(udc_dev(dum), "binding gadget driver '%s'\n",
 			driver->driver.name);
 	return 0;
@@ -927,7 +926,6 @@ static int dummy_udc_stop(struct usb_gadget *g,
 	dev_dbg(udc_dev(dum), "unregister gadget driver '%s'\n",
 			driver->driver.name);
 
-	dum->gadget.dev.driver = NULL;
 	dum->driver = NULL;
 
 	return 0;