plat-hikey: Add embedded DTB to define SDP

For Hikey, the Secure Data Path memory region definition is
done in an embedded dtb as defined in
Documentation/devicetree/bindings/reserved-memory/linaro,

plat-hikey: Add embedded DTB to define SDP

For Hikey, the Secure Data Path memory region definition is
done in an embedded dtb as defined in
Documentation/devicetree/bindings/reserved-memory/linaro,secure-heap.yaml

Signed-off-by: Olivier Masse <olivier.masse@nxp.com>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

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