Use CaptureConfig to share state between cores.

Remove awful FIFO_HACK.
TODO: Lots of repeated code...
TODO: Capture thread is signalled too frequently.

firmware/baseband/proc_wfm_audio.hpp

@@ -68,6 +68,7 @@ private:
 
 	bool configured { false };
 	void configure(const WFMConfigureMessage& message);
+	void capture_config(const CaptureConfigMessage& message);
 };
 
 #endif/*__PROC_WFM_AUDIO_H__*/