* T096, and Station G3: refactoring the 'FEM' prefs to variant-specific code

* CommonCLI: 'FEM' commands removed
* introduced static no-op attachDynamicPrefs() for all boards

examples/simple_repeater/MyMesh.cpp

@@ -982,8 +982,8 @@ void MyMesh::begin(FILESYSTEM *fs) {
   radio_driver.setRxBoostedGainMode(_prefs.rx_boosted_gain);
   MESH_DEBUG_PRINTLN("RX Boosted Gain Mode: %s",
                      radio_driver.getRxBoostedGainMode() ? "Enabled" : "Disabled");
-  board.setLoRaFemLnaEnabled(_prefs.radio_fem_rxgain);
-  board.setLoRaFemPaGainEnabled(_prefs.radio_fem_txgain);
+
+  board.attachDynamicPrefs(_prefs.getRadioPrefs());
 
   updateAdvertTimer();
   updateFloodAdvertTimer();