powerpc/86xx: Default configuration for GE Fanuc's PPC9A

Support for the PPC9A VME Single Board Computer from GE Fanuc (PowerPC
MPC8641D).

This is the default config file for GE Fanuc's PPC9A, a 6U single board
computer, based on Freescale's MPC8641D.
Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>