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Add power state validation for K3 SoCs to ensure proper PSCI power state transitions. Defining validate_power_state enables the PSCI_CPU_SUSPEND_AARCH64 capability and, in turn, CPU_SUSPEND. validate_power_state checks if the requested power level and power state are in a valid configuration. If the power state requested is standby, set the core power state to the maximum retention state. Change-Id: Ied3ebdc583b2e5b7c86923705954d763997b324e Signed-off-by: Kendall Willis <k-willis@ti.com>