CONFIG_CRYPTO_SPECK_NEON is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

NEON accelerated Speck cipher algorithms

modulename: speck-neon.ko

configname: CONFIG_CRYPTO_SPECK_NEON

Linux Kernel Configuration
└─>ARM64 Accelerated Cryptographic Algorithms
└─>NEON accelerated Speck cipher algorithms
In linux kernel since version 4.9.8 (release Date: 2017-02-04)