audio: move struct audio_config definition to audio.h

struct audio_config definition moved from hardware/audio.h to
system/audio.h for use inside the framework and not only at the HAL.

Added frame_count field to struct audio_config.

Bug: 14815883.

Change-Id: Ib0e99a60234b8e5302eb882b89e5a021a94ec2cb
1 file changed