Merging ppc32 and ppc64

[Paul Mackerras]

Joel Schopp writes:

> There are several userspace applications that parse the non-flat device 
> tree in /proc/device-tree on pSeries.  While I like the idea of the 
> flattened device tree I think we need to consider how many apps we are 
> going to break with it.

... and standardizing on the flattened device tree will mean that
every ppc and ppc64 platform has stuff in /proc/device-tree, not just
those that have OF. :)

Paul.