audio: capture modifications - WIP

Capture is always mono at audio HAL.
Capture from kernel is always stereo at 44.1kHz.
One channel is stripped before resampling and forwarding to audio HAL.

Fixed several problems in mixer_paths.xml:
 - PGA input config to single ended
 - various inversions between INxL and INxR.

Change-Id: I74f437ba61eda313b7ba2251d8b9225fe6f87173
2 files changed