revert: i9305: user configureable voice/streaming volumes

This reverts this change from 10.1, but keeps the cleaned
up parts in audio_hw.c

Change-Id: I51dc154f56b873113c36bce7dbb969ade59159f9
(cherry picked from commit 329915b1b5922b1c08877c8e52b89f10d576a254)