CONFIG_S5P_DEV_MFC is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S5P_DEV_MFC (not configurable)

modulename: dev-mfc.ko

and/or

s5p-dev-mfc.ko

configname: CONFIG_S5P_DEV_MFC

Linux Kernel Configuration
└─>Samsung Common options
└─>S5P_DEV_MFC
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Compile in setup memory (init) code for MFC

source code:
/arch/arm/plat-samsung/s5p-dev-mfc.c

is depended by
CONFIG_ARCH_EXYNOS