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: cda7305ccc4a832a3b250a69942d7cc98d3596ef
  1. atom_field_options.proto
  2. atoms.proto