RDMA/hns: Add SRQ support for hip08 kernel mode

This patch implements the SRQ(Share Receive Queue) verbs
and update the poll cq verbs to deal with SRQ complentions.

Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>