RDS: remove __init and __exit annotation

The trivial amount of memory saved isn't worth the cost of dealing with section
mismatches.

Signed-off-by: Zach Brown <zach.brown@oracle.com>

net/rds/tcp.c

@@ -274,7 +274,7 @@ struct rds_transport rds_tcp_transport = {
 	.t_prefer_loopback	= 1,
 };
 
-int __init rds_tcp_init(void)
+int rds_tcp_init(void)
 {
 	int ret;