Forget Malibu. Forget the Hollywood Hills. Forget Mulholland Drive. Downtown is the new hot LZ for A-list celebrities, at least for the beloved Johnny Depp. He looked and bought into the $2-million property six months ago, but still hasn't moved into the Art Deco Eastern Columbia Building on Broadway, which has reportedly been having problems selling all the units. To that, the LA Times gives you the hard sell:It's not too late to become......