fix Heltec boards

lib/loraboards/LoRaBoards.cpp

@@ -8,6 +8,8 @@
  *
  */
 
+#ifdef LILYGO
+
 #include "LoRaBoards.h"
 
 #if defined(HAS_SDCARD)
@@ -927,3 +929,4 @@ bool beginGPS()
     return result;
 }
 #endif
+#endif // #ifdef LILYGO

lib/loraboards/utilities.h

@@ -486,6 +486,8 @@
 
 #define USING_DIO2_AS_RF_SWITCH
 
+#elif defined(HELTEC)
+// just to prevent error
 #elif defined(T_BEAM_S3_BPF)
 
 #ifndef USING_SX1278