CONFIG_PM_RCAR is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_PM_RCAR.
Result is shown for kernelversion 5.4.229

CONFIG_PM_RCAR (not configurable)

modulename: pm-rcar.ko

configname: CONFIG_PM_RCAR

Linux Kernel Configuration
└─>PM_RCAR
In linux kernel since version 3.18 (release Date: 2014-12-07)  
source code:
arch/arm/mach-shmobile/pm-rcar.c