Update 4a-hal to work with new 4a-softmixer

Update 4a-hal to work with new 4a-softmixer version :
- Update audio configuration files to match the configuration format
expected by the mixer.
- Parse mixer attach response to get information about 'streams',
'playbacks', and 'captures'. store them in new field of controller hal
data structure.
- Create verb for each returned stream, but only one playback/capture verb
even if threre are multiple playbacks/captures returned by the mixer
attch verb.
- Return 'streams', 'playbacks', and 'captures' when info verb is called.
- If info verb is called with a json request, the request is transfered
to the mixer.

Change-Id: I65593281c34aa91ad87afbf8bebff755cc5cc6d0
Signed-off-by: Jonathan Aillet <jonathan.aillet@iot.bzh>

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