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

Amlogic Meson SoCs

modulename: meson.ko

configname: CONFIG_ARCH_MESON

Linux Kernel Configuration
└─>Amlogic Meson SoCs
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
arch/arm/mach-meson/meson.c