FCC Chair Brendan Carr told The Post Friday that the NFL could lose its antitrust exemptions if it sticks too many live games behind paywalls, as the agency clamps down on pro leagues’ deals with streaming services. Leagues are currently protected from antitrust action under the Sports Broadcasting Act of 1961, which has allowed individual teams’ TV rights to be pooled into massive packages – but as Carr noted, this exemption applies to “the sponsored telecasting” of games. “There’s a live