Chris Janson gets personal…Garth Brooks bows out… The story behind Chris Janson’s current hit, "Done," is his real life.He says, " 'Done' is a real thing. I said 'done and done' when I first saw Kelly for the first time, and so it was natural just to put it into a song." Garth Brooks is taking himself out of the running for the CMA's Entertainer of the Year.Last year, his record-setting seventh win caused a bit of controversy, with many…