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

CONFIG_PM_GENERIC_DOMAINS (not configurable)

modulename: pm_domains.ko

and/or

domain.ko

configname: CONFIG_PM_GENERIC_DOMAINS

Linux Kernel Configuration
└─>Power management and ACPI options
└─>PM_GENERIC_DOMAINS
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
arch/arm/mach-ux500/pm_domains.c
depends
CONFIG_PM