msm8974: Improve FX path

 * Previous change had bad performance in certain situations.

Change-Id: I5310fca65b8c5ff651facb0bcb0f0e19969bee5a
fix voice-speaker-mic
audio_effects: Add stereowide effect

Change-Id: Ic3dcfe7bcaa78689df9b9dcc174de5c8d7b347fd
enable CM DSP
remove dependencies
use device specific power HAL