Missing part of platformio split

ref. https://github.com/meshtastic/Meshtastic-device/pull/1141

mesh.proto

@@ -246,6 +246,10 @@ enum HardwareModel {
    * RAK WisBlock ESP32 core: https://docs.rakwireless.com/Product-Categories/WisBlock/RAK11200/Overview/
    */
   RAK11200 = 40;
+  /*
+   * Reserved ID For developing private Ports. These will show up in live traffic sparsely, so we can use a high number. Keep it within 8 bits.
+   */
+  PRIVATE_HW = 255;
 }
 
 /*