heltec v2: added display, room server role

examples/simple_room_server/main.cpp

@@ -71,6 +71,10 @@
   #include <helpers/HeltecV3Board.h>
   #include <helpers/CustomSX1262Wrapper.h>
   static HeltecV3Board board;
+#elif defined(HELTEC_LORA_V2)
+  #include <helpers/HeltecV2Board.h>
+  #include <helpers/CustomSX1276Wrapper.h>
+  static HeltecV2Board board;
 #elif defined(ARDUINO_XIAO_ESP32C3)
   #include <helpers/XiaoC3Board.h>
   #include <helpers/CustomSX1262Wrapper.h>