Fix audio policy regression

- remove A2DP and USB paths, they are handled by msm8960 audio HAL,
add A2DP and USB devices to primary route - to fix A2DP/USB playback
- restore LPA and tunnel paths
- disable fast path - to fix speakerphone volume

Change-Id: Ice9e64abab2d4d8230cc7e73518d0e0053e6618e