libfdt: move to version v1.5.1

Imports upstream libfdt version v1.5.1 [1]. Things worthy of note:

- SPDX license identifiers were added upstream in commit 94f87cd5b7c5
("libfdt: Add dual GPL/BSD

libfdt: move to version v1.5.1

Imports upstream libfdt version v1.5.1 [1]. Things worthy of note:

- SPDX license identifiers were added upstream in commit 94f87cd5b7c5
("libfdt: Add dual GPL/BSD SPDX tags to files missing license text").
They conflict with those we have added locally in commit 1bb929836182
("Add SPDX license identifiers"). We added "BSD-2-Clause" while
upstream added "GPL-2.0-or-later OR BSD-2-Clause". This commit keeps
the upstream tags.

- At this stage we carry no local modification except for two minor
things enabling C99 compliance:
1. Zero sized arrays at the end of structs fdt_node_header and
fdt_property are changed from "[0]" to "[]",
2. An extra semicolon is removed after the static function
overlay_fixup_one_phandle().
These changes were in the initial import already, commit b908c67504cd
("Import libfdt v1.4.1").

Link: [1] https://github.com/dgibson/dtc/tree/v1.5.1/libfdt
Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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Import libfdt v1.4.1

Imports libfdt code from https://git.kernel.org/cgit/utils/dtc/dtc.git
tag "v1.4.1" commit 302fca9f4c283e1994cf0a5a9ce1cf43ca15e6d2.

API header files are moved to libfdt/includ

Import libfdt v1.4.1

Imports libfdt code from https://git.kernel.org/cgit/utils/dtc/dtc.git
tag "v1.4.1" commit 302fca9f4c283e1994cf0a5a9ce1cf43ca15e6d2.

API header files are moved to libfdt/include.

Small changes to make fdt.h and libfdt.h c99 compiant.

Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Suggested-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

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