default or selected kernelversion does not have config value CONFIG_ARM_S3C24XX_CPUFREQ_DEBUGFS.
Result is shown for kernelversion 6.9.5

Export debugfs for CPUFreq

modulename: s3c24xx-cpufreq-debugfs.ko

configname: CONFIG_ARM_S3C24XX_CPUFREQ_DEBUGFS

Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Frequency scaling
└─>Export debugfs for CPUFreq
In linux kernel since version 3.11 (release Date: 2013-09-02)  
Export status information via debugfs.

source code: