dtc: Run relevant checks on dtb input as well as dts

[Jon Loeliger]

> This patch adjusts the testsuite to run most of the tests for the tree
> checking code on input in dtb form as well as dts form.  Some checks
> which only make sense for dts input (like reference handling) are
> excluded, as are those which currently take dtb input because they
> rely on things which cannot be lexically constructed in a dts file.
> 
> This shows up two small bugs in dtc, which are also corrected.
> 
> First, the name_properties test which was is supposed to remove
> correctly formed 'name' properties (because they can be reconstructed
> from tne node name) was instead removing 'name' properties even if
> they weren't correct.
> 
> Secondly, when using dtb or fs input, the runtime tree in dtc did not
> have the parent pointer initialized propertly because.built
> internally.  The appropriate initialization is added to the
> add_child() function.
> 
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

Applied.

jdl