uapi: lsm_params: Add interface to disable polling

Polling needs to be disabled to support Linear Echo Cancelation(LEC)
for SVA. Add interface to enable or disable polling through
set_params.

Signed-off-by: Chaithanya Krishna Bacharaju <chaithan@codeaurora.org>
Change-Id: If027418a6d8a1ea48dcb6a0c146f68e7dd7a2664