omap4-common: allow to set the voice-volume using an ICS blob

This fixes in-call volume on edison by redirecting calls to
set_voice_volume to the stock ICS audio-blob and additionally
calling it on set_mode and set_parameters. Other audio-functions
are still handled by the JB blob.

Change-Id: I6425dfd52202436036185f2bce4b5618d01adcaa