well told.The postscript — that he's a survivor nearing age 80 who appears to be supported personally and professionally in a way he never really had before — is less familiar.Despite some uncomfortable moments in “Brian Wilson: Long Promised Road,” that important update is the point of the documentary that premieres Tuesday at the Tribeca Film Festival in New York.The film's heart is a series of drives around southern California, where Wilson and Rolling Stone magazine editor Jason Fine talk,