audio policy: optimize preferred device selection am: 72af8011 am: 8a537f2c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22242942



Change-Id: Ideea52a33d56493213a647188a8de10cc1b684d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>