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

CONFIG_PLAT_SAMSUNG (not configurable)

configname: CONFIG_PLAT_SAMSUNG

Linux Kernel Configuration
└─>PLAT_SAMSUNG
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
Base platform code for all Samsung SoC based systems


depends
CONFIG_ARCH_S3C2410 or CONFIG_ARCH_S3C24A0 or CONFIG_ARCH_S3C64XX


is depended by
CONFIG_PLAT_S5P