msm: audio: qdsp6v2: Add RTAC voice lookup by CVP or CVS handle

Add functionality to look up RTAC voice structures by CVP
handle or CVS handle. The CVP ioctls now expect the CVP
handle to be sent instead of the CVS handle.

Change-Id: I2464e940a92b56632af45bc5649e323bed6113be
CRs-fixed: 397348
Signed-off-by: Ben Romberger <bromberg@codeaurora.org>