CONFIG_ARCH_EXYNOS3 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

SAMSUNG EXYNOS3

configname: CONFIG_ARCH_EXYNOS3

Linux Kernel Configuration
└─>Samsung EXYNOS
└─>SAMSUNG EXYNOS3
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Samsung EXYNOS3 (Cortex-A7) SoC based systems