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

CONFIG_EXYNOS_DEV_SYSMMU (not configurable)

modulename: dev-sysmmu.ko

configname: CONFIG_EXYNOS_DEV_SYSMMU

Linux Kernel Configuration
└─>SAMSUNG EXYNOS SoCs Support
└─>EXYNOS_DEV_SYSMMU
In linux kernel since version 3.5 (release Date: 2012-07-21)  
Common setup code for SYSTEM MMU in EXYNOS platforms

source code: