CRAS: config - Move aec/apm config to webrtc-apm

This change decouples CRAS and the parsing logic of APM/AEC3
configurations, CRAS build will no longer be affected by
config structure change in webrtc-apm.

BUG=chromium:906512
TEST=Build and test on nocturne
CQ-DEPEND=CL:1337170

Change-Id: Ia705cab5b60989bbcd69f7911041a6abc5f3f7be
Reviewed-on: https://chromium-review.googlesource.com/1337229
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Hsinyu Chao <hychao@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
7 files changed