msm: audio: qdsp5: Add support for MIDI method

Currenly CAD driver only supports VOICE method when setting volume.
For applying dynamic PMIC gain MIDI method is used. Changes are made
to support MIDI method also.

Change-Id: Id2d4868c88ef1fc08bbdbd3757905edc5435923c
Signed-off-by: Chaithanya Krishna Bacharaju <chaithan@codeaurora.org>
2 files changed