Add start time to LmkKillOccurred

To accompany Piper cl/222070329 and https://googleplex-android-review.git.corp.google.com/c/platform/system/core/+/5578724

Bug: 119854389
Test: Manual
Change-Id: Ib2af1b66d4649279fdcb97e7cdf8cdb92e361765
1 file changed
tree: d3478c57dc2476a28bd2cc60fca9a7fe8d8fd926
  1. atom_field_options.proto
  2. atoms.proto