aaudio: cleanup logs and add counters to dumpsys

Counters will give us some history for AAudio.
Removed some unneeded logs.
Added log to help debug intermittent volume problem.

Bug: 64310586
Test: adb shell logcat
Test: adb shell dumpsys media.aaudio
Change-Id: I012361bb4d0d0bfdedfe5ceef856b59282c8d3f0