Add USB_CDC flag to Romeo ESP32-S3 (#1512)

Signed-off-by: Paweł Chmiel <[email protected]>

Author: PabloPL

boards/dfrobot_romeo_esp32s3.json

@@ -10,7 +10,8 @@
       "-DARDUINO_DFROBOT_ROMEO_ESP32S3",
       "-DARDUINO_USB_MODE=1",
       "-DARDUINO_RUNNING_CORE=1",
-      "-DARDUINO_EVENT_RUNNING_CORE=1"
+      "-DARDUINO_EVENT_RUNNING_CORE=1",
+      "-DARDUINO_USB_CDC_ON_BOOT=1"
     ],
     "f_cpu": "240000000L",
     "f_flash": "80000000L",