cpu/esp_common: use BLE as netdev_default if nimble_netif is used
cpu/esp_common: use BLE as netdev_default if nimble_netif is used

To reduce the required RAM in default configuration, the BLE interface is used as netdev_default instead of ESP-NOW. Further network interfaces can be enabled with the modules `esp_now`, `esp_wifi` or `esp_eth`.
miri64/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,jasonatran/RIOT,kaspar030/RIOT,jasonatran/RIOT,kYc0o/RIOT,miri64/RIOT,ant9000/RIOT,ant9000/RIOT,kaspar030/RIOT,miri64/RIOT,miri64/RIOT,jasonatran/RIOT,kYc0o/RIOT,kaspar030/RIOT,kYc0o/RIOT,kYc0o/RIOT,ant9000/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,ant9000/RIOT,kaspar030/RIOT,kYc0o/RIOT,ant9000/RIOT,RIOT-OS/RIOT,miri64/RIOT