CONFIG_PM_SIMTEC is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_PM_SIMTEC (not configurable)

modulename: pm-simtec.ko

configname: CONFIG_PM_SIMTEC

Linux Kernel Configuration
└─>PM_SIMTEC
In linux kernel since version 2.6.13 (release Date: 2005-08-28)  
Common power management code for systems that are
compatible with the Simtec style of power management

source code:
arch/arm/plat-s3c24xx/pm-simtec.c