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

Samsung EXYNOS

modulename: common.ko

and/or

pmu.ko

and/or

setup-i2c0.ko

configname: CONFIG_ARCH_EXYNOS

ARM system type
└─>Samsung EXYNOS
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)

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