RDMA/hns: Encapsulate the qp db as a function

mainline inclusion
from mainline-v5.15-rc1
commit ae2854c5
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4O23M
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/commit/?id=ae2854c5d318c8415e2f033b29fcfcb81a9e9aa7

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Encapsulate qp db into two functions: user and kernel.

Link: https://lore.kernel.org/r/1629985056-57004-7-git-send-email-liangwenpeng@huawei.com


Signed-off-by: Yixing Liu <liuyixing1@huawei.com>
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
sigend-off-by: Guofeng Yue <yueguofeng@hisilicon.com>

Reviewed-by: Yangyang Li <liyangyang20@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>