net: dummy: request ops lock

Even though dummy device doesn't really need an instance lock,
a lot of selftests use dummy so it's useful to have extra
expose to the instance lock on NIPA. Request the instance/ops
locking.

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250401163452.622454-7-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dummy.c

@@ -105,6 +105,7 @@ static void dummy_setup(struct net_device *dev)
 	dev->netdev_ops = &dummy_netdev_ops;
 	dev->ethtool_ops = &dummy_ethtool_ops;
 	dev->needs_free_netdev = true;
+	dev->request_ops_lock = true;
 
 	/* Fill in device structure with ethernet-generic values. */
 	dev->flags |= IFF_NOARP;