audio: Add support for Dual MIC feature

- Update mixer_paths.xml file with mixer paths for Dual MIC devices
- Update make file to required properties to enable support for
  DualMic device and Fluence features

Bug: 8175884
Change-Id: I69f17d3023e0043cbf80f7a2c98e039894ae58ef
Signed-off-by: Ravi Kumar Alamanda <ralama@codeaurora.org>
Signed-off-by: Iliyan Malchev <malchev@google.com>
2 files changed