Log kernel wakeup attribution details to stats log

Each kernel wakeup can have multiple reasons. For each reason that
we are able to correlate with a wakeup, we log an atom to stats-log
with more details.

Currently, we only log the uids that should be blamed for this reason.
More details will be added later as needed.

Test: statsd_testdrive 588
Test: atest FrameworksServicesTests:CpuWakeupStatsTest

Bug: 195684213
Change-Id: I07df9470086927dc3f06dfd7afc5d569f2a34cb7