powerpc/86xx: enable the framebuffer console on the MPC8610 HPCD

Enable framebuffer console support by default in the defconfig on the
Freescale MPC8610 HPCD reference board.  This allows the boot messages to
be shown on the video display.

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