Implement a way to extract memory information from a node. This can be

used to extract information about how much RAM is available or where a
controller is in the address space and how big its IO space is.

Add a way to get the device tree's size.  This is helpful to find out
how much you need to copy if you want to move the tree somewhere else.

Also add helpers to easily retrieve integers from a property.

ok jsg@

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