Only one Totem path per barbarian or anything else that can choose rage powers as a barbarian. Otherwise, non barbarians couldn't rage, as rage states "A barbarian can call upon..."
I actually thought that the Totem warrior archtype was a way to make totem powers barbarian only
It only tells of "like a barbarian", never that any restrictions are lifted. Thus the same rules apply to a Skald as to the Barbarian when selecting rage Powers.