crypto/mlx5: fix queue indexing

crypto/mlx5: fix queue indexing

The crypto QP consumer (ci) and producer (pi) indexes are increased
with each successful enqueue/dequeue operations.

However the QP pi index is calculated with a wraparound the number
of elements while the QP ci does not.

This is causing incorrect engine calculation for encqueued WQ values
(wq->pi - wq->ci) and eventually the device stops accepting new enqueue
operations.

Fixed by removing the wraparound on QP pi and using a temp calculation
where wraparound values are needed.

Fixes: 8e196c08ab53 ("crypto/mlx5: support enqueue/dequeue operations")
Cc: stable@dpdk.org
Signed-off-by: Tal Shnaiderman <talshn@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>