hns3 udma: support modify jfr function

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


CVE: NA

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The modify_jfr function is used to modify the threshold of the remaining
WQEs in the JFR. When the number of remaining WQEs is less than the
threshold, the UDMA hardware triggers the JFR_LIMIT_REACH asynchronous
event.

Signed-off-by: Yu Zhang <zhangyu709@huawei.com>