Playback activity monitor: fix MediaPlayer / AudioTrack reporting

Revert to original playback state reporting for MediaPlayer and
AudioTrack, due to observed issue with routing reporting.

Bug: 179218630
Test: atest CtsMediaTestCases:android.media.cts.AudioPlaybackConfigurationTest
Change-Id: Id92189f52c056af545fae8bed75d91589ede031c