Searching for a node by path should also take into account an /aliases
reference. This series reworks the of_find_node_by_path() code to handle
that use-case easily. It also makes it possible to start a search at a
child node, which Pantelis needs for the FDT overlay work.

I've done some simple testing on this series, but it needs a lot more
attention and the testcases can use beefing up.