CONFIG_S3C64XX_SETUP_SPI is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C64XX_SETUP_SPI (not configurable)

modulename: setup-spi.ko

and/or

configname: CONFIG_S3C64XX_SETUP_SPI

Linux Kernel Configuration
└─>Samsung S3C64XX (deprecated, see help)
└─>S3C64XX_SETUP_SPI
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Common setup code for SPI GPIO configurations