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H A Dplatform.mkf67fa69cb6937a7fc559bbec4a7acce5edefa888 Thu Jul 11 00:45:39 UTC 2019 Andre Przywara <andre.przywara@arm.com> rpi4: Amend DTB to advertise PSCI

The device tree provided by the official Raspberry Pi firmware uses
spin tables for SMP bringup.

One of the benefit of having TF-A is that it provides PSCI services, so
let's rewrite the DTB to advertise PSCI instead of spin tables.
This uses the (newly exported) routine from the QEMU platform port.

Change-Id: Ifddcb14041ca253a333f8c2d5e97a42db152470c
Signed-off-by: Andre Przywara <andre.przywara@arm.com>