Troubled children form the basis for three forthcoming CBS programs. Marsha Mason stars as a psychologist trying to cure a teen-age boy of "elective mutism" in "Silent Rage". . . . In "Who Hears the Child's Cry?," Lindsay Wagner plays a social worker who suspects that a 6-year-old boy with whom she is working has been sexually molested. . . . And a "CBS Schoolbreak Special" called "Have You Tried Talking to Patty?" will look at the life of a deaf teen-ager.