default or selected kernelversion does not have config value CONFIG_PM_SLEEP.
Result is shown for kernelversion 6.9.9

CONFIG_PM_SLEEP (not configurable)

modulename: pm.ko

and/or

suspend.ko

and/or

main.ko

and/or

cpu.ko

configname: CONFIG_PM_SLEEP

Linux Kernel Configuration
└─>Power management and ACPI options
└─>PM_SLEEP
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
arch/arm/mach-highbank/pm.c
selects
CONFIG_PM
CONFIG_SRCU