RDMA/hns: Limit the index of wr id

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

The index of wqe may be larger than the  max deepth of srq,
so the index of wqe should be limit to max deepth of srq.

Feature or Bugfix: Bugfix

Signed-off-by: wangsirong <wangsirong@huawei.com>
Signed-off-by: liyangyang (M) <liyangyang20@huawei.com>
Reviewed-by: oulijun <oulijun@huawei.com>
Reviewed-by: liuyixian <liuyixian@huawei.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>