Both RT Journey Measurements Are Equal Following a FW Update

[nquarton]

Both RTJM values are the same values following a FW update. This seems unexpected given the way we understand they are calculated and the fact they differ in the cold boot case.

While we understand one of these values is not useful as it is a journey of a journey measurement, the concern is that something may be broken because they are equal.

[jhand2]

This is intentional, but I'm open to representing it a different way if we prefer. During hitless update, we populate the RTJM with the latest value of the RT journey PCR: https://github.com/chipsalliance/caliptra-sw/blob/main/runtime/src/drivers.rs. See update_dpe_rt_journey implementation.