CONFIG_CPU_FREQ_IMX is not available for the selected architecture x86.
Result is shown for architecture arm
CPUfreq driver for i.MX CPUs
modulename: cpufreq.ko
configname: CONFIG_CPU_FREQ_IMX
Linux Kernel Configuration
└─>CPU Power Management
└─>CPUfreq driver for i.MX CPUs
In linux kernel since version 2.6.21 (release Date: 2007-04-25)
This enables the CPUfreq driver for i.MX CPUs.