ASoC: qcom: audioreach: cleanup and calibration

Merge series from srinivas.kandagatla@oss.qualcomm.com:

Sorry to resend this series once again, as some of the patches seems
to be dropped/rejected by email client from previous send.

This patchset:
 - cleans up some of the audioreach tokens which are unused
 - adds missing documentation
 - add support for static calibration support which is required for ECNS
   an speaker protection support.

Tested this with Single Mic ECNS on SM8450 platform.