Draft: Add CDC ECM support
CDC Ethernet support has not really implemented until now. There was USB class recognition but no handling of data transfer. Tested with
- VIVANCO USB3.0 Ethernet GigaBit Adapter
- Huawei E8372h-320 USB Surfstick (4G and WLAN Server) and Huawei E3372h-320
- Vodafone ZTE R216z
- ANKER A8352/ R. Fischer. CONCEPTRONIC DONNG06G
- CoreChips SR9900 USB Ethernet Adapter