ASoC: msm: Fix RTAC to use VSID

All voice sessions use unique VSID for active
sessions in CVD. RTAC get param for voice
sessions require this VSID to work correctly with
CVD. This change fixes the issue of using proper
VSID in RTAC.

Change-Id: I6eb8e64ee5d7fad212b77882c897e5feb3cc96c5
CRs-fixed: 506008
Signed-off-by: Venkat Sudhir <vsudhir@codeaurora.org>