victara: Clean up audio board flags

* Correctly enable FLUENCE (it was using the MSM8960
* Remove flags that were enabling already enabled functionality
* Remove flags that are not in the msm8974 hal (left over from ghost)
* Disable speaker protection in the build because we were disabling
  it in build.prop anyway.

Change-Id: I58768a7e0847c61bb4a8a7689887789e3c814695