Attrell Cordes, a.k.a. rapper Prince Be of P.M. Dawn, died yesterday at age 46. The cause of death was kidney disease resulting from diabetes, the group stated on its website. Prince Be and brother Jarrett Cordes, a.k.a. DJ Minutemix, founded P.M. Dawn in 1988. They went on to become influential in 90's R&B, scoring mellow, soulful hits like "I'd Die Without You" and "Set…