pkg/lwip: add auto-init support for transciever ENC28J60
pkg/lwip: add auto-init support for transciever ENC28J60

miri64/RIOT,authmillenon/RIOT,kaspar030/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,ant9000/RIOT,basilfx/RIOT,OlegHahm/RIOT,smlng/RIOT,kYc0o/RIOT,kaspar030/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,smlng/RIOT,kaspar030/RIOT,jasonatran/RIOT,smlng/RIOT,kYc0o/RIOT,yogo1212/RIOT,miri64/RIOT,ant9000/RIOT,OlegHahm/RIOT,ant9000/RIOT,basilfx/RIOT,RIOT-OS/RIOT,ant9000/RIOT,OTAkeys/RIOT,basilfx/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,kaspar030/RIOT,yogo1212/RIOT,authmillenon/RIOT,basilfx/RIOT,authmillenon/RIOT,kYc0o/RIOT,yogo1212/RIOT,jasonatran/RIOT,jasonatran/RIOT,jasonatran/RIOT,miri64/RIOT,kYc0o/RIOT,authmillenon/RIOT,basilfx/RIOT,smlng/RIOT,jasonatran/RIOT,kYc0o/RIOT,ant9000/RIOT,OTAkeys/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,kaspar030/RIOT,yogo1212/RIOT,smlng/RIOT,miri64/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,miri64/RIOT