return reportedLatencyHasChanged when AccumulatedLatency changes

[lhoward]

https://avnu.org/wp-content/uploads/2014/05/AVnu_Stream-Reservation-Protocol-v1.pdf

This value should not change after it has been registered by a participant. If a participant is sent an attribute that has had the AccumulatedLatency change from its previously registered value, it will change the attribute propagation from Talker Advertise to Talker Fail with the FailureInformation code "Reported Latency Has Changed".

The error code is defined but unreferenced.

[lhoward]

We may also need to round up portTcMaxLatency to avoid other bridges failing streams because the PTP neighbour latency has changed.