dsp: q6afe: Add support to control AANC noise level

Existing software supports only high AANC level with minimum noise.
Requirement is to support different noise levels when AANC is
enabled for better AANC effect.

Change-Id: I343d00473937f68eb86533e88b25083d554b79b1
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>