Modified audio effect API.

Moved and renamed media/EffectApi.h to hardware/audio_effect.h
Modified the effect library API to expose a library info structure
containing an interface functions table.
Also removed enums for audio channels, audio format and devices
from effect API and use values from system/audio.h instead.

Change-Id: I32fd752e449337410115121c1c60c699d95247c2
1 file changed