Mark Wahlberg is one of the most bankable, Oscar-nominated actors in Hollywood.But that wasn't the case 20 years ago when he was known as Marky Mark and was a popular rapper. He rolled with a group called the Funky Bunch.At the premiere of his new movie "The Gambler" in Los Angeles on Monday night, Wahlberg, 43, talked at length about his past run-ins with Leonardo DiCaprio before the duo co-starred in 1995's "The...