Report total latency instead of average for jobs last run

Instead of computing the average on the device, upload the
total sum of the latencies. Server can divide by the event count
if it wants to get the average.

Also change the latency buckets to 1 hr, 2 hrs, 4 hrs, 8 hrs and
greater than 8 hrs.

Bug: 70297451
Test: launch an app
      dumpsys batterystats --checkin | grep jbd,
      Observe the dumped values for the app

Change-Id: Iecda808594fc960fb16fa0407e5875bbc47db43a