Revert "[3/3] AudioFX: Add center frequency param to bassboost"

This reverts commit 292f0fd5cb8acc95167b321bff5e021a493bfbed.
Revert "[3/3] AudioEffect: Add a stereo widener effect"

This reverts commit 866bcd4e040e6781aa4bd3f30550ddf36acb7a7c.