Revert "audio: allow standby for direct track" am: eeb744f5f9 am: 1910616e2e am: 1ca115c4d9 am: a04f7eb46b

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

Change-Id: I58f9c57f79b5a6b9a44092eb2aa33d42087a9795