net: usb: ax88179_178a: fix missing stop entry in driver_info

Adds the missing .stop entry in the Belkin driver_info structure.

Fixes: e20bd60b

 ("net: usb: asix88179_178a: Add support for the Belkin B2B128")
Signed-off-by: Wilken Gottwalt <wilken.gottwalt@mailbox.org>
Signed-off-by: David S. Miller <davem@davemloft.net>