Revert^2 "AudioService: protect volume APIs for AAOS"

This reverts commit fbb0af3b.

Reason for revert: isolated flag behavior in AudioManager that
  should only be for AAOS.

Bug: 310673477
Test: atest android.media.audio.cts.AudioManagerTest

Change-Id: If8a781c7e5482cb2a0a4c504547048b7efa5d19c