Add two new multi protocols (#4240)

- Add binding sound while multi module is binding.

radio/src/opentx.cpp

@@ -1785,7 +1785,11 @@ void doMixerCalculations()
 #if defined(PXX) || defined(DSM2)
     static uint8_t countRangecheck = 0;
     for (uint8_t i=0; i<NUM_MODULES; ++i) {
+#if defined(MULTIMODULE)
+      if (moduleFlag[i] != MODULE_NORMAL_MODE || (i == EXTERNAL_MODULE && multiModuleStatus.isBinding())) {
+#else
       if (moduleFlag[i] != MODULE_NORMAL_MODE) {
+#endif
         if (++countRangecheck >= 250) {
           countRangecheck = 0;
           AUDIO_PLAY(AU_SPECIAL_SOUND_CHEEP);