dev/psci: Add a way to query the PSCI method
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Authored by andrew on Oct 22 2024, 5:37 PM.

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Summary

Some drivers need to know if the instruction needed to call into the
PSCI firmware is a SMC or an HVC instruction. To support this add a new
function that returns the method and rework other parts of the PSCI
code to use this to set the call functions.