boards/native: add ztimer configuration
boards/native: add ztimer configuration

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