stm32f429i-disc1: remove obsolete spi_divtable include
stm32f429i-disc1: remove obsolete spi_divtable include

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