add WIP for Unit C6L (#7433)

* add WIP for Unit C6L
* adapt to new config structure
* Add c6l BLE and screen support (#7991)
* Minor c6l fix
* Move out of PRIVATE_HW
---------
Co-authored-by: Austin <vidplace7@gmail.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Jonathan Bennett <jbennett@incomsystems.biz>
Co-authored-by: Jason P <Xaositek@users.noreply.github.com>
Co-authored-by: Markus <Links2004@users.noreply.github.com>

src/nimble/NimbleBluetooth.h

@@ -12,10 +12,15 @@ class NimbleBluetooth : BluetoothApi
     bool isConnected();
     int getRssi();
     void sendLog(const uint8_t *logMessage, size_t length);
+#if defined(NIMBLE_TWO)
+    void startAdvertising();
+#endif
 
   private:
     void setupService();
+#if !defined(NIMBLE_TWO)
     void startAdvertising();
+#endif
 };
 
 void setBluetoothEnable(bool enable);