Retired NASCAR champion Kevin Harvick gave props to Brexton Busch for the strength he has shown in the wake of the tragic passing of his father, two-time Cup Series champion Kyle Busch. Brexton, 11, has since returned to racing following the tragedy as he competed in last week’s Cook Out Summer Shootout at Charlotte Motor Speedway. The youngster finished second in one of his races, narrowly missing out on a win after being passed on the last lap…