add new submode for default datarate handling

mission/devices/devicedefinitions/SyrlinksDefinitions.h

@@ -8,10 +8,11 @@ namespace syrlinks {
 
 enum Submode {
   DEFAULT,
-  TX_STANDBY,
-  TX_MODULATION_LOW_DATARATE,
-  TX_MODULATION_HIGH_DATARATE,
-  TX_CW,
+  RX_ONLY,
+  RX_AND_TX_DEFAULT_DATARATE,
+  RX_AND_TX_LOW_DATARATE,
+  RX_AND_TX_HIGH_DATARATE,
+  RX_AND_TX_CW,
   NUM_SUBMODES
 };