feat: add support for RadioMaster TX16S MK3 (#7017)

Co-authored-by: philmoz <phil.a.mitchell@gmail.com>
Co-authored-by: 3djc <3djc@gh.com>
Co-authored-by: Peter Feerick <5500713+pfeerick@users.noreply.github.com>

radio/src/functions.cpp

@@ -109,6 +109,10 @@ PLAY_FUNCTION(playValue, mixsrc_t idx)
     PLAY_DURATION(val * 60, PLAY_TIME);
   } else if (idx == MIXSRC_TX_VOLTAGE) {
     PLAY_NUMBER(val, UNIT_VOLTS, PREC1);
+#if defined(LUMINOSITY_SENSOR)
+  } else if (idx == MIXSRC_LIGHT) {
+    PLAY_NUMBER(val, UNIT_RAW, 0);
+#endif
   } else {
     if (idx <= MIXSRC_LAST_CH) {
       val = calcRESXto100(val);