hns3 udma: feature of record doorbell

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


CVE: NA

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This patch is the code for record doorbell. Record doorbell is
a 8B memory which saves value of jfr pi and jfc ci. It works
as doorbell but not real-time. When hardware need to update
jfr-pi for example, hardware would read jfr record doorbell to
update latest jfr pi value.

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