Add new atom to log userspace reboot performance

A first stab at the atom to log.
Actual logic to log will be in the follow up CL.

Test: builds
Bug: 135984674
Change-Id: Id3f81ced73ea708f1dcfbcfd66f554e8daed8ccc
1 file changed
tree: 44610a90dd0d020188db113cc8d5769de9e4f782
  1. bin/