Eddie Johnson did a lot of good things on the court during his 17 years as one of the NBA’s premier sharpshooters.Now he’s focused on making his mark off it.The longtime guard and current Phoenix Suns commentator is in the midst of a three-day charity event to help low-income single moms get to college.Johnson had a celebrity golf round on Thursday morning at Talking Stick Resort in Scottsdale, and will host a poker game on Friday evening, follo…