dsp: voice: Vote for BMS power state during voice call

In PM8916, 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: 2356600
Change-Id: I0c1ffedeca544f13805505311598dbdc311f5b90
Signed-off-by: Aditya Bavanari <abavanar@codeaurora.org>