ARM: trusted_foundations: implement prepare_idle()
Support the prepare_idle() firmware call, which is necessary to properly support CPU idling. Signed-off-by: NAlexandre Courbot <acourbot@nvidia.com> Acked-by: NOlof Johansson <olof@lixom.net> Signed-off-by: NStephen Warren <swarren@nvidia.com>
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