Charles Osgood has announced his retirement as anchor of CBS Sunday Morning, calling an end to a remarkable 22-year reign of the popular, quietly eye-opening program. Osgood, who has been at CBS for 45 years, has set September 25 as his final broadcast as anchor of Sunday Morning, and CBS plans a celebration of his career during the episode. The network says Osgood, 84, will continue as the anchor of The Osgood File on CBS Radio Network and various stations, and he’ll…