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Recently upstreamed changes to OP-TEE mean that it is possible for OP-TEE
to provide a DTB overlay directly to subsequent boot stages thus negating
the requirement to bundle a DTB in the FIP.

This patch switches off the dependency on the DTB in the FIP descriptor
instead we will provide the necessary data as an overlay from OP-TEE.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>