usb: renesas: 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: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index 6a3afa9..883b012 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -845,7 +845,6 @@
 
 	/* first hook up the driver ... */
 	gpriv->driver = driver;
-	gpriv->gadget.dev.driver = &driver->driver;
 
 	return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
 }
@@ -861,7 +860,6 @@
 		return -EINVAL;
 
 	usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
-	gpriv->gadget.dev.driver = NULL;
 	gpriv->driver = NULL;
 
 	return 0;