Saquon Barkley is fed up with playing games. He challenged the Giants on Monday to either franchise tag him a second straight year or “let me go” into free agency. Just don’t make him wait. “They did it last year, so I’m numb to it,” Barkley said at his locker about the tag. “I don’t have any feelings toward that at all. [But] if you’re gonna do it, just don’t wait until March 5. Just get it over with. If not, let me go. Simple.” Barkley, 26, had promised last week that he would speak honestly with GM Joe Schoen and head coach Brian Daboll at his exit meeting. But the Giants did not hold indiv…