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sunxi: use late core_power_down_wfi()
As we do not use the management processor, the cores have to turn their own power off when requested. Use the newly introduced late-power-off callback to disable the core's power gate, which will make the core stopping execution immediately. This fixes bringing a CPU back online after it has been offlined before. Signed-off-by: Andre Przywara <firstname.lastname@example.org>
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