default or selected kernelversion does not have config value CONFIG_CPUFREQ_DT_RUST.
Result is shown for kernelversion 6.16-rc7

Rust based Generic DT based cpufreq driver

modulename: rcpufreq_dt.ko

configname: CONFIG_CPUFREQ_DT_RUST

Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Frequency scaling
└─>Rust based Generic DT based cpufreq driver
In linux kernel since version 6.1.145 (release Date: 2025-07-14)  
This adds a Rust based generic DT based cpufreq driver for frequency
management. It supports both uniprocessor (UP) and symmetric
multiprocessor (SMP) systems.

If in doubt, say N.

source code: