UNIC: add support for tc speed limitation

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I850RQ


CVE: NA

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In UB mode, support for 5 TC is required, while alse needing support for
TC-level rate limiting to differentiate between services.

This patch adds support for UB on the basis of originally only supporting
TC speed limit in ROH mode.

Signed-off-by: Junxin Chen <chenjunxin1@huawei.com>