audio: Drop STT meta test app

Revert "hal: Extract source track meta data for 2mic"

This reverts commit 46def6d7.

Revert "hal: update copyrights in DOA source track files"

This reverts commit ba30519e.

Revert "hal: Extract source track meta data"

This reverts commit cf29fe90.

Change-Id: Idab5191cfeab470ddc64f01a6b1ed15612bd705b

Revert "configs: Rb3Gen2: Install STT meta test app"

This reverts commit 87cf41cc.

Revert "configs: Rb3Gen2: enable support for stt meta test app"

This reverts commit 05d6c0f2.

Change-Id: I60e54d1c94f6bad9fc35ed50ad16b212a17f2d27