ios: disable non-compatible part of coreaudiolayer

Device management is done another way in iOS thus we don't have
access to CoreAudio/Hardware in CoreAudio framework. Disabling those
part allow us to compile. Maybe some things will need to be rewritten.
In this case it we'll be done in another patch (either as fixing
existing code or as another layer if need be)

Change-Id: I9f8e365bb173cf1df8bd6431371b844b092ec0cb
Tuleap: #313