Move consts and structs used by framework to system/audio_effect.h

A lot of code (including clients of AudioFlinger) use constants
and structs from hardware/audio_effect.h for convenience, without
actually interacting with HAL. Thus these definitions are more
like the ones from system/audio.h and need to be moved to system/.

Test: make

Change-Id: I17a210fc7bde96380be42b50c60f10f2b1017e3a
1 file changed