nvme-rdma: use new shared CQ mechanism

Has the driver use shared CQs providing ~10%-20% improvement as seen in
the patch introducing shared CQs. Instead of opening a CQ for each QP
per controller connected, a CQ for each QP will be provided by the RDMA
core driver that will be shared between the QPs on that core reducing
interrupt overhead.

Signed-off-by: Yamin Friedman <[email protected]>
Signed-off-by: Max Gurtovoy <[email protected]>
Reviewed-by: Or Gerlitz <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

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