Link Debounce Feature

[JaiOCP]

https://github.com/opencomputeproject/SAI/pull/2236 is closed

Linkup delay works by establishing a link up debounce/delay timer. In a link state transition from down -> up, the timer starts but the link up notification is suppressed until the timer expires. If there is a link down before the timer expires, the link up debouncing process immediately stops without the link up notification being issued, and the link down notification is sent. Linkup delay only debounces link up events. Link down events are always immediately notified.