CONFIG_CPU_FREQ_S3C24XX is not available for the selected architecture x86.
Result is shown for architecture arm

CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)

modulename: cpu-freq.ko

configname: CONFIG_CPU_FREQ_S3C24XX

Linux Kernel Configuration
└─>CPU Power Management
└─>CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)
In linux kernel since version 2.6.32 (release Date: 2009-12-02)
This enables the CPUfreq driver for the Samsung S3C24XX family
of CPUs.

For details, take a look at <a href="https://www.kernel.org/doc/Documentation/cpu-freq">Documentation/cpu-freq</a>.

If in doubt, say N.
source code:

depends
CONFIG_ARCH_HAS_CPUFREQ
CONFIG_ARCH_S3C2410
CONFIG_CPU_FREQ
CONFIG_EXPERIMENTAL