sam0/spi: fix SPI mode assignment
sam0/spi: fix SPI mode assignment

Signed-off-by: dylad <d56dfe611c7cd6204525c7c9b6afc5e84aed0f5d@mesotic.com>

aeneby/RIOT,cladmi/RIOT,toonst/RIOT,RIOT-OS/RIOT,cladmi/RIOT,basilfx/RIOT,OlegHahm/RIOT,miri64/RIOT,x3ro/RIOT,gebart/RIOT,rfuentess/RIOT,smlng/RIOT,ant9000/RIOT,smlng/RIOT,kaspar030/RIOT,josephnoir/RIOT,biboc/RIOT,toonst/RIOT,jasonatran/RIOT,aeneby/RIOT,gebart/RIOT,BytesGalore/RIOT,mtausig/RIOT,basilfx/RIOT,kbumsik/RIOT,OlegHahm/RIOT,BytesGalore/RIOT,biboc/RIOT,OTAkeys/RIOT,basilfx/RIOT,biboc/RIOT,smlng/RIOT,jasonatran/RIOT,mtausig/RIOT,BytesGalore/RIOT,mfrey/RIOT,ant9000/RIOT,gebart/RIOT,kbumsik/RIOT,rfuentess/RIOT,OTAkeys/RIOT,A-Paul/RIOT,rfuentess/RIOT,cladmi/RIOT,smlng/RIOT,A-Paul/RIOT,biboc/RIOT,toonst/RIOT,RIOT-OS/RIOT,biboc/RIOT,yogo1212/RIOT,authmillenon/RIOT,kaspar030/RIOT,authmillenon/RIOT,toonst/RIOT,aeneby/RIOT,ant9000/RIOT,smlng/RIOT,aeneby/RIOT,josephnoir/RIOT,A-Paul/RIOT,kYc0o/RIOT,A-Paul/RIOT,yogo1212/RIOT,BytesGalore/RIOT,mfrey/RIOT,avmelnikoff/RIOT,miri64/RIOT,lazytech-org/RIOT,kYc0o/RIOT,kYc0o/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,ant9000/RIOT,kaspar030/RIOT,x3ro/RIOT,OTAkeys/RIOT,kbumsik/RIOT,x3ro/RIOT,aeneby/RIOT,avmelnikoff/RIOT,lazytech-org/RIOT,mfrey/RIOT,kaspar030/RIOT,gebart/RIOT,kYc0o/RIOT,yogo1212/RIOT,mtausig/RIOT,authmillenon/RIOT,OTAkeys/RIOT,jasonatran/RIOT,toonst/RIOT,authmillenon/RIOT,miri64/RIOT,miri64/RIOT,mfrey/RIOT,BytesGalore/RIOT,A-Paul/RIOT,mfrey/RIOT,lazytech-org/RIOT,mtausig/RIOT,miri64/RIOT,yogo1212/RIOT,kbumsik/RIOT,jasonatran/RIOT,basilfx/RIOT,avmelnikoff/RIOT,avmelnikoff/RIOT,basilfx/RIOT,OTAkeys/RIOT,rfuentess/RIOT,lazytech-org/RIOT,jasonatran/RIOT,x3ro/RIOT,mtausig/RIOT,yogo1212/RIOT,kYc0o/RIOT,authmillenon/RIOT,cladmi/RIOT,authmillenon/RIOT,yogo1212/RIOT,josephnoir/RIOT,OlegHahm/RIOT,josephnoir/RIOT,cladmi/RIOT,gebart/RIOT,OlegHahm/RIOT,kbumsik/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,lazytech-org/RIOT,ant9000/RIOT,RIOT-OS/RIOT,avmelnikoff/RIOT,x3ro/RIOT,josephnoir/RIOT,rfuentess/RIOT