Merge changes I1d2263f0,Iaa2c8046,Idcf09587,I8bdcd0da,If80513b6, ...

* changes:
  Add parcelable test for classes in libaudiofoundation.
  Add export header lib headers to libaudiofoundation_headers.
  Add equals functions for classes in libaudiofoundation.
  Make audio stuff parcelable.
  Clear up bit mask usage in audio policy.
  Make AudioGain parcelable.