net: datalink: Remove unused declarations

These declarations is not used after ipx protocol removed.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230726144054.28780-1-yuehaibing@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/datalink.h

@@ -23,6 +23,4 @@ struct datalink_proto {
 	struct list_head node;
 };
 
-struct datalink_proto *make_EII_client(void);
-void destroy_EII_client(struct datalink_proto *dl);
 #endif