By Tzvi Machlin Coach K isn’t the only Duke coach leaving Durham this spring. Former Duke star and current assistant coach Nolan Smith is apparently on his way out as well. According to ESPN NBA insider Marc J. Spears, Smith has informed the Duke staff that he is leaving to accept a job as associate head coach at Louisville. Smith will be working under newly-appointed Cardinals head coach Kenny Payne. Spears noted that Smith has previous ties to the University of Louisville. Smith’s father, the late-great Derek Smith, won an NCAA title with the Cardinals in 1980. He has a tattoo of his father’…