msm8974: Improve FX path

 * Previous change had bad performance in certain situations.

Change-Id: I5310fca65b8c5ff651facb0bcb0f0e19969bee5a
msm8974-common: Increase mic gain for voice recognition

* Separate this case from voice call case

Change-Id: I0ab21ddb478a1a9b974c3f4e98098d721154ab79