Iowa’s Luka Garza using doubters to fuel NBA dreams from Erin Walsh with YardBarker.com/www.yardbarker.com It’s unclear if Iowa star Luka Garza will find success in the NBA. However, he’s not letting the doubters throw him off. In an interview with TMZ Sports, Garza said he’s using all the negativity to fuel his NBA dreams and is ready to prove that he belongs at the next level. “I love it!” Garza said of the negativity. “I love to hear it. I love to see it. It’s fun for me! They don’t know it because they probably don’t like me, but it’s…