RDMA/hns: Set rdma_ah_attr type for querying qp

When querying qp, It needs to return RoCE device ah_attr type
that may be specific to RoCE devices.

Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Shaobo Xu <xushaobo2@huawei.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>