Bsongis/ram saving (#6685)

RAM saving. Stacks reduced to have some more RAM available than 2.2 on all boards

radio/src/audio.cpp

@@ -529,7 +529,7 @@ void audioTask(void * pdata)
   RTOS_WAIT_MS(1000); // 1s
 #endif
 
-  if (!unexpectedShutdown) {
+  if (!globalData.unexpectedShutdown) {
     AUDIO_HELLO();
   }