CHIEFS 51, TEXANS 31 KANSAS CITY, Mo. (AP) — Patrick Mahomes and the Kansas City Chiefs are back in the AFC championship game. How they returned to the brink of their first Super Bowl appearance in 50 years was unlike anything anybody could have imagined. After digging a 24-0 hole against Houston early in the second quarter Sunday, Mahomes and the rest of the high-flying Chiefs embarked on the…