boards: nucleo-l476rg: enable the CAN feature
boards: nucleo-l476rg: enable the CAN feature

miri64/RIOT,kaspar030/RIOT,yogo1212/RIOT,authmillenon/RIOT,kYc0o/RIOT,kYc0o/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,basilfx/RIOT,RIOT-OS/RIOT,miri64/RIOT,OlegHahm/RIOT,miri64/RIOT,jasonatran/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,miri64/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,authmillenon/RIOT,jasonatran/RIOT,authmillenon/RIOT,kaspar030/RIOT,OlegHahm/RIOT,basilfx/RIOT,authmillenon/RIOT,basilfx/RIOT,kaspar030/RIOT,authmillenon/RIOT,kYc0o/RIOT,kaspar030/RIOT,ant9000/RIOT,ant9000/RIOT,jasonatran/RIOT,basilfx/RIOT,ant9000/RIOT,jasonatran/RIOT,OTAkeys/RIOT,yogo1212/RIOT,OTAkeys/RIOT,kaspar030/RIOT,jasonatran/RIOT,kYc0o/RIOT,yogo1212/RIOT,miri64/RIOT,OlegHahm/RIOT,basilfx/RIOT,kYc0o/RIOT,OlegHahm/RIOT,ant9000/RIOT,ant9000/RIOT,yogo1212/RIOT