RDMA/cm: Delete not implemented CM peer to peer communication

Peer to peer support was never implemented, so delete it to make code less
clutter.

Link: https://lore.kernel.org/r/20200310091438.248429-6-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Mark Zhang <markz@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

include/rdma/ib_cm.h

@@ -360,7 +360,6 @@ struct ib_cm_req_param {
 	u32			starting_psn;
 	const void		*private_data;
 	u8			private_data_len;
-	u8			peer_to_peer;
 	u8			responder_resources;
 	u8			initiator_depth;
 	u8			remote_cm_response_timeout;