audio: add a flag to indicate removing pre-scale volume

Bug: 302553525
Test: atest com.android.server.audio.AudioDeviceVolumeManagerTest
      atest android.media.audio.cts.AudioDeviceVolumeManagerTest

Change-Id: I49daa9afbb64c6093341fe315d3a51a4477f74cf
Signed-off-by: Jasmine Cha <chajasmine@google.com>