default or selected kernelversion does not have config value CONFIG_CRYPTO_MORUS640_GLUE.
Result is shown for kernelversion 6.9.9

CONFIG_CRYPTO_MORUS640_GLUE (not configurable)

modulename: morus640_glue.ko

configname: CONFIG_CRYPTO_MORUS640_GLUE

Linux Kernel Configuration
└─>Cryptographic API
└─>CRYPTO_MORUS640_GLUE
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Common glue for SIMD optimizations of the MORUS-640 dedicated AEAD
algorithm.

source code:
arch/x86/crypto/morus640_glue.c