CONFIG_MACH_CPUIMX27 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Eukrea CPUIMX27 module

modulename: mach-cpuimx27.ko

configname: CONFIG_MACH_CPUIMX27

Linux Kernel Configuration
└─>Eukrea CPUIMX27 module
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
Include support for Eukrea CPUIMX27 platform. This includes
specific configurations for the module and its peripherals.

source code:
arch/arm/mach-imx/mach-cpuimx27.c