CONFIG_MX51_EFIKA_COMMON is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_MX51_EFIKA_COMMON (not configurable)

modulename: mx51_efika.ko

configname: CONFIG_MX51_EFIKA_COMMON

Linux Kernel Configuration
└─>MX51_EFIKA_COMMON
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
source code:
arch/arm/mach-imx/mx51_efika.c