Police are investigating the suspected robbery of a 26-year-old man who was found naked and badly burned in the lobby of a Polo Grounds building at 8th Ave. and 155th St. in Manhattan. Trevor Lyons' clothes were found on the 16th floor of the building, where it appears he was attacked at about 8 a.m. Saturday morning. Lyons was attending what the Daily News described as a "drug-fueled party" in the building. He is not......