RDMA/hns: Fix 0-length sge calculation error

mainline inclusion
from mainline-v5.11
commit 0fd0175e
category: bugfix
bugzilla: NA
CVE: NA

When querying QP, the ULPs should be informed of the max length of inline
data supported by the hardware.

Signed-off-by: Shunfeng Yang <yangshunfeng2@huawei.com>
Signed-off-by: Yangyang Li <liyangyang20@huawei.com>
Reviewed-by: chunzhi hu <huchunzhi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>