UPSTREAM: scripts/dtc: Update to upstream version v1.4.3

Using the update-dtc-source.sh script from Linux v4.14-rc1 import the
portions of dtc that we require. We bring in update-dtc-source.sh and

UPSTREAM: scripts/dtc: Update to upstream version v1.4.3

Using the update-dtc-source.sh script from Linux v4.14-rc1 import the
portions of dtc that we require. We bring in update-dtc-source.sh and
scripts/dtc/Makefile from Linux v4.14-rc1. Rework DTC_FLAGS handling to
not require a test.

Change-Id: Id69453c629574df1be4cd3bb0f0f0e86516eeb47
Signed-off-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit c0e032e0090d6541549b19cc47e06ccd1f302893)

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