MediaMetrics: Report last statsd atoms pushed

Report all pushed statsd atoms (previously only audio
analytics atoms were listed). Move the statsd atom info
out of AudioAnalytics to the main dump.

Report last 4 atoms sent, 30 shown on dumpsys --all.

Test: adb shell dumpsys media.metrics
Bug: 184263266
Change-Id: I2abc2fe7a0ec42fcf20f6b9fca490c6396c5272e