SEATTLE — Almost three weeks after the firing of defensive coordinator Ken Norton Jr., the Seahawks appear to be putting their defensive coaching staff in place. Defensive-line coach and assistant head coach Clint Hurtt is expected to soon be named the Seahawks’ defensive coordinator, sources told The Seattle Times. The Seahawks also are expected to add Ed Donatell as a defensive assistant, sources confirmed. ESPN reported the expected hiring of Donatell earlier Friday. Seattle also hopes to add former Chicago Bears defensive coordinator Sean Desai to its defensive staff. All three have worked…