RDMA/hns: Treat revision HIP08_A as a special case

Set revisions that equal to or higher than HIP08_B as default to maintain
backward compatibility.

Link: https://lore.kernel.org/r/1582363039-10714-1-git-send-email-liweihang@huawei.com


Signed-off-by: Lang Cheng <chenglang@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>