RDMA/hns: Initialize the PCI device for hip08 RoCE

The hip08 RoCE engine is a PCI device. This patch mainly
obtains some information of PCI device for hip08 RoCE from
hns3 NIC driver in the initialization.

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