ASoC: msm: qdsp6v2: Vote for BMS power state during voice call

In MSM8916, battery monitoring system(BMS) goes into a low power
state when APSS is suspended. This can cause loss of BMS accuracy,
if APSS goes to suspend during a voice call.
Fix this by setting BMS power state to high/low during start/end
of voice call.

CRs-Fixed: 660545
Change-Id: I9b0c89e0626eadddbd46234fa99db15ae8d32a39
Signed-off-by: Venkata Narendra Kumar Gutta <vgutta@codeaurora.org>