Revert "Kill audio_effects.conf"

This reverts commit cb7ccfe5f9ac26e3ea6609d5c6ab5a017e0173a7.
Stereo -- BUT WIDER

This will break DSPManager at runtime if a ROM doesn't have stereowide-supporting DSPManager

Change-Id: I9eabcb6a7656c83ada8a7dd01b61ec32c4ad5b08