boards/nucleo-f303k8: bugfix: spi is AF5, not AF0
boards/nucleo-f303k8: bugfix: spi is AF5, not AF0

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