kernelconfig_penguin
CONFIG_ARM_PSCI is not available for the default architecture x86.
Result is shown for architecture arm

Support for the ARM Power State Coordination Interface (PSCI)

configname: CONFIG_ARM_PSCI

Linux Kernel Configuration
└─> Kernel Features
└─> Support for the ARM Power State Coordination Interface (PSCI)

Say Y here if you want Linux to communicate with system firmware
implementing the PSCI specification for CPU-centric power
management operations described in ARM document number ARM DEN
0022A ("Power State Coordination Interface System Software on
ARM processors").