LOS ANGELES — The concept of playing an NFL game on Christmas Day sounded a lot better to Jay Feely when the schedule came out in the spring than it did as the holiday season approached. It was 2010, and Feely was kicking for the Arizona Cardinals, who were 5-10 and going nowhere. They were playing host to Dallas, likewise stuck in the mud at 5-10. “If you play or practice on Christmas morning,…