ppc4xx: Fix problem with NOR range assignment in Canyonlands ft_board_setup

This patch fixes the problem, that the current fdt board fixup code only
set's one range, the one for NOR. By this it's overwriting the already
correctly configured values done in __ft_board_setup(). Just remove this
now unneeded NOR fixup and all the ranges are correctly defined.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Dirk Eibach <eibach@gdsys.de>
Cc: Felix Radensky <felix@embedded-sol.com>