edtlib.Device is just a devicetree node augmented with binding
information and some interpretation of properties. Rename it to
edtlib.Node to make that clearer. That also avoids calling things like
flash partition nodes "devices", which is a bit confusing.
I called it edtlib.Device instead of edtlib.Node originally to avoid
confusion with dtlib.Node, but in retrospect it probably makes it more
confusing on the whole. Something like edtlib.ENode might work too, but
it's probably overkill. Clients of edtlib.py only interact with
edtlib.Node, so the only potential for confusion is within edtlib.py
itself, and it doesn't get too bad there either.
Piggyback some documentation nits, and consistently write it
"devicetree" instead of "device tree", to match the spec.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
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