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The enhanced pylibfdt support in U-Boot needed for binman was a placeholder while upstreaming of this work continued. This is now complete, so bring in the changes and update the tools as needed. There are quite a few changes since we decided to split the implementation into three fdt classes instead of two. The Fdt.del_node() method was unfortunately missed in this process and will be dealt with later. It exists in U-Boot but not upstream. Further syncing of libfdt probably needs to wait until we assess the code-size impact of all the new checking code on SPL and possibly provide a way to disable it. Signed-off-by: Simon Glass <sjg@chromium.org>