RDMA/hns: Support write with notify

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8C2IP



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This patch adds support for the write with notify operation.
Including support for configuring cq to enable write with notify,
and qp to enable write with notify.

At the same time, a pair of APIs are added in the kernel side,
rdma_register_notify_addr()/rdma_unregister_notify_addr().

Users need to use this API to register the notify address.

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>