TIAF: cleanup playback command and remaining public APIs

Bug: 213836031
Test: atest android.media.tv.interactive.cts.TvInteractiveAppViewTest
Test: atest android.media.tv.interactive.cts.TvInteractiveAppManagerTest
Test: atest android.media.tv.interactive.cts.TvInteractiveAppServiceTest
Change-Id: I305c2d98184d5907aec864a5ff7cfa01db2282ba
5 files changed