default or selected kernelversion does not have config value CONFIG_CRYPTO_MORUS1280.
Result is shown for kernelversion 6.9.9

MORUS-1280 AEAD algorithm

modulename: morus1280.ko

configname: CONFIG_CRYPTO_MORUS1280

Linux Kernel Configuration
└─>Cryptographic API
└─>MORUS-1280 AEAD algorithm
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Support for the MORUS-1280 dedicated AEAD algorithm.

source code: