boards/arduino-mkrfox1200: Add board specific Kconfig symbols
boards/arduino-mkrfox1200: Add board specific Kconfig symbols

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