Revert "audio: allow standby for direct track" am: eeb744f5f9 am: 1910616e2e am: 1ca115c4d9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/11901472

Change-Id: I186ccb5fee5f9206a9a93ced1f524269c3bd91fa