spark-core: remove obsolete spi_divtable
spark-core: remove obsolete spi_divtable

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