RDMA/hns: Add srq check judgment on 4.19 version

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

Since it is not judged whether qp receives srq, srq is associated with qp,
the commit wr to rq is successful.

Feature or Bugfix:Bugfix

Signed-off-by: Yixing Liu <liuyixing1@huawei.com>
Reviewed-by: liuyixian <liuyixian@huawei.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>