ASoC: bolero: Add concurrency support on audio capture path

During voice activation and audio capture concurrency usecase,
there is no common reference count for DMIC clock enablement,
results into mute when one usecase tears down. Change enables
a common reference count in bolero codec driver between voice
activation usecase and audio capture usecase to avoid mute
during VA and audio capture concurrency.

Change-Id: I424c941178d7e9ff91288a50ba27605b2b9d3abe
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>