nucleo-f103rb: remove obsolete spi_divtable
nucleo-f103rb: remove obsolete spi_divtable

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