cpu/esp32/esp_eth: remove gnrc specific code
cpu/esp32/esp_eth: remove gnrc specific code


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