[RFC 0/3] of: Refactor device tree linked lists

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I threw these patches together as part of getting the device_node
lifecycle issues sorted out so that the overlay patches can be merged.
It makes it possible to add and remove nodes without jumping through
crazy hoops.

I haven't yet decided if it is a good idea. It does increase the size of
deviec_node by 2 pointers which increases the footprint, but it
simplifies a lot of the code.  Although, if I was really concerned about
footprint I would be trying to get rid of the ->full_name string and
just use the path component instead. The primary user of full_name is
various printk format strings around the kernel and we could get the
same behaviour using a %p variant.

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