dtc: Add code to make diffing trees easier

[Jon Loeliger]

> On Mon, Oct 11, 2010 at 11:37:38AM +1100, David Gibson wrote:
> > This patch adds a "dtdiff" script to do a useful form diff of two
> > device trees.  This automatically converts the tree to dts form (if
> > it's not already) and uses a new "-s" option in dtc to "sort" the
> > tree.  That is, it sorts the reserve entries, it sorts the properties
> > within each node by name, and it sorts nodes by name within their
> > parent.
> > 
> > This gives a pretty sensible diff between the trees, which will ignore
> > semantically null internal rearrangements (directly diffing the dts
> > files can give a lot of noise due to the order changes).
> > 
> > Signed-off-by: David Gibson <david at gibson.dropbear.id.au>
> 
> Acked-by: Grant Likely <grant.likely at secretlab.ca>

I am inclined to take this patch.  Any other comments?  Matt?

Thanks,
jdl