Add support for Xiao ESP32C6 with external antenna configuration

variants/xiao_c6/target.h

@@ -4,11 +4,12 @@
 #include <RadioLib.h>
 #include <helpers/radiolib/RadioLibWrappers.h>
 #include <helpers/ESP32Board.h>
+#include <helpers/esp32/XiaoC6Board.h>
 #include <helpers/radiolib/CustomSX1262Wrapper.h>
 #include <helpers/AutoDiscoverRTCClock.h>
 #include <helpers/SensorManager.h>
 
-extern ESP32Board board;
+extern XiaoC6Board board;
 extern WRAPPER_CLASS radio_driver;
 extern AutoDiscoverRTCClock rtc_clock;
 extern SensorManager sensors;