cpu/esp32: remove unused periph_cpu.c
cpu/esp32: remove unused periph_cpu.c


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