Add a debugging symbole to mixer, (temp) fix for sound capture device

Change-Id: Ide7654ac232ea92d47f158093fc3ee21e3fa0565
Using new Libaudio library
- Added support for capture device (audiorecord works)
- Library stolen from crespo (google)

Still to do:
- Clean the library
- Add support for calling
- Fix asound.conf
- Improve audio downsampeling, using rubisch downsampeling for now
- Improve recording sound

Change-Id: I20aab735a98ed862c86184f6d45898459ea3f97b