OKLAHOMA CITY (AP) — If there was an injury report for such things, the San Antonio Spurs would be listing the voice of coach Mitch Johnson as questionable these days. It’s a bit scratchy right now, almost as if he’s been gargling with gravel.And it won’t get better anytime soon. He was set to do a lot of screaming on Wednesday night in Game 2 of the Western Conference finals, wi...