Move FIFO and write size to CaptureConfig structure.

Now configured from baseband, where write size and appropriate FIFO size is known.

firmware/application/capture_thread.cpp

@@ -21,4 +21,5 @@
 
 #include "capture_thread.hpp"
 
+FIFO<uint8_t>* StreamOutput::fifo = nullptr;
 Thread* CaptureThread::thread = nullptr;