With his 6'4" lanky frame, matinee-idol looks and calm and collected demeanor, James Brolin was the textbook-perfect leading man for TV, and his career in that medium has been extensive, including seven years as Dr. Steven Kiley on "Marcus Welby, M.D." (ABC, 1969-76) and five years as Peter McDemott, the general manager of "Hotel" (ABC, 1983-88).Brolin was raised in the Westwood area of Los Angeles, not far from 20th Century Fox, the studio where he began in show business, first aspiring to be a cinematographer or director. But the studio soon put him under contract as an actor, and he made