Hendrick Motorsports will race for a Cup Series championship next Sunday at Phoenix after William Byron secured the final transfer spot with a sixth-place finish in Sunday’s Xfinity 500 at Martinsville. How Byron ended up with the fourth and final spot will be talked about for years to come. Christopher Bell rode the wall on the final lap to pass Bubba Wallace, giving him the points advantage over Byron for the spot. Riding the wall, however, is illegal after Ross Chastain’s “Hail Melon” move at Martinsville two years ago. Bell was penalized 27 minutes after the race concluded as NASCAR took i…