rds: RDS diagnostics when connections are stuck in Receiver Not Ready state.

rds: RDS diagnostics when connections are stuck in Receiver Not Ready state.

    Orabug:26522310

    Enhance diagnosabilty,when an RDS IB/CM connection gets into
    "Receiver Not Ready" state.These are the data added to the
    per-RDS/IB connection info that is currently displayed through
    rds-info:

    - w_alloc_ctr of the receive ring (struct rds_ib_work_ring)
    - w_free_ctr
    - qp_num number of the connection

Signed-off-by: hui.han <hui.han@oracle.com>
Reviewed-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>