Fixing bug in bootanalyze when the event time is 0 am: 9f0e7264b2 am: 4f61898bd2

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/extras/+/11829463

Change-Id: Ieb7defcfe0e15ee413eea8573ae2ea3d913388cd