Update AppCompacted WW atom to include device ZRAM usage.

We log free ZRAM in kilobytes before and after the compaction event.

Test: manually verified am_compact and statsd logging looks correct.
Bug: 123623746

Change-Id: I20d5991fb1d060584d415b76c30769fe9f049ffd
1 file changed
tree: 7740f78e512a3f874fbf33441c0978aee5160266
  1. stats/