configs: include sdm660 mtp mixer paths in system image

-Include sdm660 mtp mixer paths in system image to enable audio
  on internal codec MTPs.
-Update controls for headst-mic and ear boost.

Change-Id: Iac5a33453da276aad03396564f911a3f960fe6f4
Signed-off-by: Niranjan Reddy Dumbala <ndumba@codeaurora.org>
3 files changed