Norah O’Donnell is set to host “CBS Mornings” next week — sparking chatter that she might be poised to return to the morning show after a seven-year hiatus, sources told The Post. O’Donnell, who had co-hosted the network’s highly-rated morning show — then called “CBS This Morning” — with Gayle King and Charlie Rose, will return to hosting duties next week when she’s in the Northeast for her book tour. It is unclear if the move is a test to see if there’s any chemistry between King, O’Donnell,