RDMA/hns: Support rq record doorbell for the user space

RDMA/hns: Support rq record doorbell for the user space

BugLink: https://bugs.launchpad.net/bugs/1762755
This patch adds interfaces and definitions to support the rq record
doorbell for the user space.

Signed-off-by: Yixian Liu <liuyixian@huawei.com>
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>
(cherry picked from commit e088a685eae94a0607b8f7b99949a0e14d748813)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>