default or selected kernelversion does not have config value CONFIG_CRYPTO_AEGIS256_AESNI_SSE2.
Result is shown for kernelversion 6.8.2

AEGIS-256 AEAD algorithm (x86_64 AESNI+SSE2 implementation)

modulename: aegis256-aesni.ko

configname: CONFIG_CRYPTO_AEGIS256_AESNI_SSE2

Linux Kernel Configuration
└─>Cryptographic API
└─>AEGIS-256 AEAD algorithm (x86_64 AESNI+SSE2 implementation)
In linux kernel since version 3.10 (release Date: 2013-06-30)  
AESNI+SSE2 implementation of the AEGSI-256 dedicated AEAD algorithm.

source code: