CONFIG_SOC_IMX27 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_SOC_IMX27 (not configurable)

modulename: cpu-imx27.ko

and/or

clk-imx27.ko

configname: CONFIG_SOC_IMX27

Linux Kernel Configuration
└─>Freescale i.MX family
└─>SOC_IMX27
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
source code:
/arch/arm/mach-imx/