Underp an ifdef

Change-Id: If0e0f1fddcad3d7ec6987ecc5d4e6a40e605c39a
audio: Add support for FLAC in compress offload path

- Add new audio format for FLAC
- Add FLAC in valid formats list
- Add bitWidth in offload info

Change-Id: Ic716aff8b7cdb28b03f32f686eca33ff0beb981c