libfdt: Export overlay_apply_node() as fdt_overlay_apply_node()

This function is useful to merge a subset of DT into another DT, for
example if some prior-stage firmware passes a DT fragment to U-Boot
and U-Boot needs to merge it into its own DT. Export this function
to permit implementing such functionality.

Reviewed-by: Simon Glass <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>
Cc: Nobuhiro Iwamatsu <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Tom Rini <[email protected]>

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