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* Add libfdt.mk helper makefile
* Remove unused libfdt files
* Minor changes to fdt.h and libfdt.h to make them C99 compliant

Adapted from 754d78b1

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Change-Id: I0847f1c2e6e11f0c899b0b7ecc522c0ad7de210c
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Import libfdt code from https://git.kernel.org/cgit/utils/dtc/dtc.git


tag "v1.4.2" commit ec02b34c05be04f249ffaaca4b666f5246877dea.

This version includes commit d0b3ab0a0f46ac929b4713da46f7fdcd893dd3bd,
which fixes a buffer overflow in fdt_offset_ptr().

Change-Id: I05a30511ea68417ee7ff26477da3f99e0bd4e06b
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

* Move libfdt API headers to include/lib/libfdt
* Add libfdt.mk helper makefile
* Remove unused libfdt files
* Minor changes to fdt.h and libfdt.h to make them C99 compliant
Co-Authored-By: Jens Wiklander <jens.wiklander@linaro.org>

Change-Id: I425842c2b111dcd5fb6908cc698064de4f77220e

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

Change-Id: Ia0d966058beee55a9047e80d8a05bbe4f71d8446