boards/arduino-nano: Add Kconfig symbols
boards/arduino-nano: Add Kconfig symbols

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