Revert^2 "Add (virtual) device ID to AudioPolicy/AudioMix"

This reverts commit a27f0bcb520a93bb594402ab2293e08435502197.

Reason for revert: Fixing the CarAudioServiceUnitTest in this topic.

Change-Id: I0aeeb810922ee6470ac73c5fcf8aa43c5ae0c748
8 files changed