Clean-up constant definitions (#2148)

esphome/components/api/api_connection.cpp

@@ -745,9 +745,7 @@ DeviceInfoResponse APIConnection::device_info(const DeviceInfoRequest &msg) {
   resp.mac_address = get_mac_address_pretty();
   resp.esphome_version = ESPHOME_VERSION;
   resp.compilation_time = App.get_compilation_time();
-#ifdef ARDUINO_BOARD
-  resp.model = ARDUINO_BOARD;
-#endif
+  resp.model = ESPHOME_BOARD;
 #ifdef USE_DEEP_SLEEP
   resp.has_deep_sleep = deep_sleep::global_has_deep_sleep;
 #endif