CONFIG_SOC_IMX1 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_SOC_IMX1 (not configurable)

modulename: mach-imx1.ko

and/or

clk-imx1.ko

configname: CONFIG_SOC_IMX1

Linux Kernel Configuration
└─>Freescale i.MX support
└─>SOC_IMX1
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
source code:
/arch/arm/mach-imx/


is selected by
CONFIG_PINCTRL_IMX1