RDMA/i40iw: Set queue pair state when being queried

The API for ib_query_qp requires the driver to set qp_state and
cur_qp_state on return, add the missing sets.

Fixes: d3749841

 ("i40iw: add files for iwarp interface")
Signed-off-by: Changcheng Liu <changcheng.liu@aliyun.com>
Acked-by: Shiraz Saleem <shiraz.saleem@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>