hns3 udma: support of flush cqe

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I85R2F


CVE: NA

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Driver send sq_pi to hardware so hardware can report
flush cqes. The user-mode driver invokes user_ctrl to
instruct the kernel-mode driver to execute flush_cqe.
The kernel-mode driver pass sq_pi to hardware by CMD
of modify_qp_to_error.

Signed-off-by: Weibo Zhao <zhaoweibo3@huawei.com>