tests/periph_i2c: fix typo 'consumtion' -> 'consumption'
tests/periph_i2c: fix typo 'consumtion' -> 'consumption'

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