powerpc/85xx: enable the framebuffer console for the defconfigs

Enable framebuffer console support by default in the defconfigs for the
Freescale 85xx-based reference board.  This allows the boot messages to
be shown on the video display on the P1022DS.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>