CONFIG_SOC_IMX23 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_SOC_IMX23 (not configurable)

modulename: clock-mx23.ko

configname: CONFIG_SOC_IMX23

Linux Kernel Configuration
└─>SOC_IMX23
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
source code:

depends
CONFIG_ARCH_MXS

is selected by
CONFIG_DEBUG_IMX23_UART

is depended by
CONFIG_ARCH_MXS