IB/srpt: use new shared CQ mechanism

Have the driver use shared CQs provided by the rdma core driver.  This
provides the advantage of improved efficiency handling interrupts.

Link: https://lore.kernel.org/r/20200722135629.49467-3-maxg@mellanox.com


Signed-off-by: Yamin Friedman <yaminf@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>