ipq806x: audio: provide volume management callback

Plug in volume management function into the audio driver structure.

BRANCH=none
BUG=chrome-os-partner:38048
TEST=it is possible to control the volume of the speaker beep.

Change-Id: Iad0a07c5ea6bbeea4ea12eb91c9962ea08c11730
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/261077
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed