Revert "audio: allow standby for direct track" am: eeb744f5f9 am: 1910616e2e am: dac1d1dc3f

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

Change-Id: I8cbf23dd2830429e31f497b3e8ef6ac2e66c6438