apbuart: Use of_find_node_by_path to find root node.
Signed-off-by: NKristoffer Glembo <kristoffer@gaisler.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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Signed-off-by: NKristoffer Glembo <kristoffer@gaisler.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>