CONFIG_ETRAXFS is not available for thedefaultarchitecture x86.
Result is shown for architecture cris
default or selected kernelversion does not have config value CONFIG_ETRAXFS.
Result is shown for kernelversion 6.7-rc3

ETRAX-FS-V32

modulename: cris-etraxfs-cpufreq.ko

configname: CONFIG_ETRAXFS

Processor type
└─>ETRAX-FS-V32
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
Support CRIS V32.

source code:
drivers/cpufreq/cris-etraxfs-cpufreq.c