audio: Flag for disabling pre-scale absolute volume.

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

Change-Id: I8cc1c6706deb9d70a398a45d99b6ceeaf9312c4a
Signed-off-by: Jasmine Cha <chajasmine@google.com>