CONFIG_SOC_EXYNOS5800 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Samsung EXYNOS5800

configname: CONFIG_SOC_EXYNOS5800

Linux Kernel Configuration
└─>Samsung Exynos
└─>Samsung EXYNOS5800
In linux kernel since version 3.10 (release Date: 2013-06-30)