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

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