rhine: Enable audio offload

Change-Id: Ia25f7d9da1d2f11c6ac86600f31abe1f2004920a
audio: set fluencetype to fluence

* Stock (and CM/AOSP audio) support persist.dualmic.config,
  but audio-caf has moved on to ro.qc.sdk.audio.fluencetype
* Set fluencetype to fluence for the dual mic config

Change-Id: I5929f92021cce667bc6cdc0139525d4ac4377798