Revert "net: Guaranetee the proper ordering of the loopback device."

This reverts commit ae33bc40c0.

drivers/net/loopback.c

@@ -204,8 +204,17 @@ static __net_exit void loopback_net_exit(struct net *net)
 	unregister_netdev(dev);
 }
 
-/* Registered in net/core/dev.c */
-struct pernet_operations __net_initdata loopback_net_ops = {
+static struct pernet_operations __net_initdata loopback_net_ops = {
        .init = loopback_net_init,
        .exit = loopback_net_exit,
 };
+
+static int __init loopback_init(void)
+{
+	return register_pernet_device(&loopback_net_ops);
+}
+
+/* Loopback is special. It should be initialized before any other network
+ * device and network subsystem.
+ */
+fs_initcall(loopback_init);