default or selected kernelversion does not have config value CONFIG_ARM_MEDIATEK_CPUFREQ.
Result is shown for kernelversion 6.9-rc1

CPU Frequency scaling support for MediaTek SoCs

modulename: mediatek-cpufreq.ko

configname: CONFIG_ARM_MEDIATEK_CPUFREQ

Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Frequency scaling
└─>CPU Frequency scaling support for MediaTek SoCs
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This adds the CPUFreq driver support for MediaTek SoCs.

source code: