powerpc/pq2fads: Update device tree for use with device-tree-aware u-boot.

Add aliases, and correct CS0 offset to match how u-boot
programs it (this was not a problem with cuImage because
the wrapper would reprogram the localbus to match the device
tree).

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>