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This adds the following commits from upstream:

756ffc4f52f6 Build pylibfdt as part of the normal build process
8cb3896358e9 Adjust libfdt.h to work with swig
b40aa8359aff Mention pylibfdt in the documentation
12cfb740cc76 Add tests for pylibfdt
50f250701631 Add an initial Python library for libfdt
cdbb2b6c7a3a checks: Warn on node name unit-addresses with '0x' or leading 0s
4c15d5da17cc checks: Add bus checks for simple-bus buses
33c3985226d3 checks: Add bus checks for PCI buses
558cd81bdd43 dtc: Bump version to v1.4.4
c17a811c62eb fdtput: Remove star from value_len documentation
194d5caaefcb fdtget: Use @return to document the return value
d922ecdd017b tests: Make realloc_fdt() really allocate *fdt
921cc17fec29 libfdt: overlay: Check the value of the right variable
9ffdf60bf463 dtc: Simplify asm_emit_string() implementation
881012e44386 libfdt: Change names of sparse helper macros
bad5b28049e5 Fix assorted sparse warnings
672ac09ea04d Clean ...