CONFIG_S3C24XX_SIMTEC_USB is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C24XX_SIMTEC_USB (not configurable)

modulename: simtec-usb.ko

and/or

configname: CONFIG_S3C24XX_SIMTEC_USB

Linux Kernel Configuration
└─>Samsung S3C24XX SoCs (deprecated, see help)
└─>Samsung S3C24XX SoCs Support
└─>S3C24XX_SIMTEC_USB
In linux kernel since version 3.1 (release Date: 2011-10-24)  
USB management code for common Simtec S3C24XX boards