Some SoCs do not include a PSCI for power management and defer it to
something else instead. Add a CPU reset hook to account for this, and
use it in the psci driver.
Obtained from: Juniper Networks, Inc.
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Is there a reason to not have cpu_reset_hook = psci_reset by default so we can remove the NULL check?
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Given that psci.c is "standard" on arm64 and it will not do anything until/unless it probes/attaches (and thus psci_softc is non-NULL), yes, I believe it could just default to psci_reset (maybe with a comment stating the reasons why?)