net: remove exports for netdev_name_node_alt_create() and destroy

netdev_name_node_alt_create() and netdev_name_node_alt_destroy()
are only called by rtnetlink, so no need for exports.
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20220310223952.558779-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/core/dev.c

@@ -340,7 +340,6 @@ int netdev_name_node_alt_create(struct net_device *dev, const char *name)
 
 	return 0;
 }
-EXPORT_SYMBOL(netdev_name_node_alt_create);
 
 static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node)
 {
@@ -368,7 +367,6 @@ int netdev_name_node_alt_destroy(struct net_device *dev, const char *name)
 
 	return 0;
 }
-EXPORT_SYMBOL(netdev_name_node_alt_destroy);
 
 static void netdev_name_node_alt_flush(struct net_device *dev)
 {