audio: remove custom audio_policy -- didnt need it

Change-Id: I6c6d11d5b2a32a0529248fc2c9e57dca9b7fb35c
audio: move audio_policy.conf in with the other audio files

Change-Id: Ic68a7a0e3593a25a1fb2de413a9f42c74d6fcc93
audio: set base volumes for speak/headset

Change-Id: Ib18c01371978ef69979995b216ac0807f8e8de8a
audio: bugfixes for audio routing and remove volume settings, now set in xml

Change-Id: I5d87ab7c12776c01eb0e33d45951dd09c3ce8dc7