cpu/fe310: Silence -Wcast-align
cpu/fe310: Silence -Wcast-align

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