Bsongis/autoupdate (#6521)

Auto update internal chips at boot if /FIRMWARE/autoupdate.frsk is present on SD

radio/src/targets/taranis/board.cpp

@@ -137,6 +137,11 @@ void boardInit()
 
   pwrInit();
 
+#if defined(AUTOUPDATE)
+  telemetryPortInit(FRSKY_SPORT_BAUDRATE, TELEMETRY_SERIAL_WITHOUT_DMA);
+  sportSendByteLoop(0x7E);
+#endif
+
 #if defined(STATUS_LEDS)
   ledInit();
   ledGreen();