PASADENA, Calif. — William Christopher, best known as the calm-voiced Father Francis Mulcahy on “M.A.S.H.,” has died. He was 84. His son, John Christopher, told KABC his father died of non-lung small cell carcinoma. RELATED: On New Year’s Eve, someone from Mariah Carey’s team asked an embarrassingly obvious question William Christopher played the role of Mulcahy…