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Update the libfdt source files, the upstream commit is 73e0f143b73d
("libfdt: fdt_strerror(): Fix comparison warning").

This brings us the fixes for the signed/unsigned comparison warnings,
so platforms can enable -Wsign-compare now.

Change-Id: I303d891c82ffea0acefdde27289339db5ac5a289
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

This version corresponds to the following commit <7be250b>
libfdt: Correct condition for reordering blocks

Also, updated the Juno romlib jumptable with fdt APIs.

Change-Id: Ib6d28c1aea81c2144a263958f0792cc4daea7a1f
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>

Change-Id: Iad7adaf0b16a3d086594cb3432210ac2c4e207f8
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

The current version of libfdt (1.4.2) has been modified to integrate it
in this repository. In order to do a clean import it is needed to remove
the current version first.

Change-Id: I2cab8c8e5632280d282fa7a2f2339768a0ad1e0f
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

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

Change-Id: Ia0d966058beee55a9047e80d8a05bbe4f71d8446