CONFIG_IMX_HAVE_PLATFORM_MX2_EMMA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_IMX_HAVE_PLATFORM_MX2_EMMA (not configurable)

modulename: platform-mx2-emma.ko

configname: CONFIG_IMX_HAVE_PLATFORM_MX2_EMMA

Linux Kernel Configuration
└─>IMX_HAVE_PLATFORM_MX2_EMMA
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/mach-imx/devices/platform-mx2-emma.c