i9500: add initial audio HAL

* Based off manta HAL using audio_route library
i9500: add Audience ES325 support library

* Copy of manta's at commit ID: 25305b9e71
* ES305 and ES325 are pretty much the same, and expose the same API, so
  we can use this library with only minor changes.
i9500: add some resampler debugging messages
i9500: set PCM config options
i9500: enable Audience ES325 support
i9500: split playback into low latency and deep buffer paths
i9500: add audio_policy.conf