[scripts] Fix periodic-stats.py for use when ROI start time does not start at 0 (when using the oneIPC fast-forwarding model during cache warmup, for example)
[scripts] Fix periodic-stats.py for use when ROI start time does not start at 0 (when using the oneIPC fast-forwarding model during cache warmup, for example)

abanaiyan/sniper,abanaiyan/sniper,abanaiyan/sniper,abanaiyan/sniper,abanaiyan/sniper