drivers/itg320x: convert to xtimer_msleep()
drivers/itg320x: convert to xtimer_msleep()

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