st-hal: Initialize sample rate for acdb calibration to 16kHz

Initialize the sample rate used for acdb calibration to resolve the issue
where ADM mixer controls are sent to the DSP for LPI sessions without an
ADM profile type configured. Currently there is a sample rate mismatch between
the acdb calibration and ADM mixer control sample rates for the single mic
usecase.

Change-Id: I46eaba91168e99720b3c3a61741a3dfed7af95d6
1 file changed