AA | Idempotence and robust of AAEL (AA Eventlog)

[Xynnn007]

Now when we enable eventlogging for AA, the launch of AA would create an AAEL file and extend the INIT event to hardware.

In some cases the AA would is not always available and would restart. This would let the hardware status be extended twice but the AAEL file does not record the corresponding records. We need a patch for AA to detect whether the AAEL file already exists. If so, the INIT event will not be extended to hardware and AA just append new entries to the AAEL file.

Another corner case that needs to be considered is if AA crashes during the AAEL recording process, how to reorganize the previously unrecorded entry and RTMR status when AA starts next time to protect atomicity