ppc4xx: Add variable "korat_usbcf" for Korat board

The new environment variable "korat_usbcf" selects the USB
port used by the Korat board's CompactFlash controller.

Signed-off-by: Larry Johnson <lrj@acm.org>
Signed-off-by: Stefan Roese <sr@denx.de>
2 files changed