Aaron Boone knows exactly how he’ll keep DJ LeMahieu in lineup

PORT CHARLOTTE, Fla. — If DJ LeMahieu performs as well as the Yankees expect, the infielder they signed to a two-year, $24 million deal will look like a steal. A career .298 hitter who won the NL batting title in 2016 with a .348 average, the 30-year-old LeMahieu is a two-time All-Star and won three…