IB/mlx5: Support statistic q counter configuration

Add support for ib callbacks counter_bind_qp(), counter_unbind_qp() and
counter_dealloc().

Signed-off-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>