ffmpeg: Add support for high resolution audio

 * Output interleaved 24-bit (32-bit packed) PCM at up to 192KHz for
   use with PCM offload. Falls back to resampling if disabled.

Change-Id: Ie1bd3066c0459fb99a9d4ff9e28d6a65e234408a
Merge pull request #2 from CyanogenMod/cm-11.0

ffmpeg: Add support for high resolution audio