default or selected kernelversion does not have config value CONFIG_CRYPTO_BLAKE2S.
Result is shown for kernelversion 6.9.8

BLAKE2s digest algorithm

modulename: blake2s_generic.ko

configname: CONFIG_CRYPTO_BLAKE2S

Linux Kernel Configuration
└─>Cryptographic API
└─>BLAKE2s digest algorithm
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Implementation of cryptographic hash function BLAKE2s
optimized for 8-32bit platforms and can produce digests of any size
between 1 to 32. The keyed hash is also implemented.

This module provides the following algorithms:

- blake2s-128
- blake2s-160
- blake2s-224
- blake2s-256

See https://blake2.net for further information.

source code: