CONFIG_SOC_EXYNOS5420 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Samsung Exynos5420

modulename: clk-exynos5-subcmu.ko

and/or

clk-exynos5420.ko

configname: CONFIG_SOC_EXYNOS5420

Linux Kernel Configuration
└─>Samsung Exynos
└─>Samsung Exynos5420
In linux kernel since version 3.10 (release Date: 2013-06-30)  


is selected by
CONFIG_SOC_EXYNOS5800