CONFIG_EXYNOS5420_MCPM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Exynos5420 Multi-Cluster PM support

modulename: mcpm-exynos.ko

configname: CONFIG_EXYNOS5420_MCPM

Linux Kernel Configuration
└─>Samsung EXYNOS
└─>Exynos5420 Multi-Cluster PM support
In linux kernel since version 3.16 (release Date: 2014-08-03)  
This is needed to provide CPU and cluster power management
on Exynos5420 implementing big.LITTLE.

source code:
arch/arm/mach-exynos/mcpm-exynos.c