default or selected kernelversion does not have config value CONFIG_X86_FEATURE_NAMES.
Result is shown for kernelversion 6.9.9

Processor feature human-readable names

modulename: capflags.ko

configname: CONFIG_X86_FEATURE_NAMES

Linux Kernel Configuration
└─>Processor type and features
└─>Processor feature human-readable names
In linux kernel since version 3.18 (release Date: 2014-12-07)  
This option compiles in a table of x86 feature bits and corresponding
names. This is required to support /proc/cpuinfo and a few kernel
messages. You can disable this to save space, at the expense of
making those few kernel messages show numeric feature bits instead.

If in doubt, say Y.

source code: