CONFIG_CRYPTO_SHA256_ARM is not available for the selected architecture x86.
Result is shown for architecture arm

Hash functions: SHA-224 and SHA-256 (NEON)

modulename: sha256-arm.ko

configname: CONFIG_CRYPTO_SHA256_ARM

Linux Kernel Configuration
└─>Accelerated Cryptographic Algorithms for CPU (arm)
└─>Hash functions: SHA-224 and SHA-256 (NEON)
In linux kernel since version 3.10 (release Date: 2013-06-30)
SHA-224 and SHA-256 secure hash algorithms (FIPS 180)

Architecture: arm using
- NEON (Advanced SIMD) extensions
source code:
/arch/arm/crypto/

depends
NOT CONFIG_CPU_V7M or CONFIG_ARM_CRYPTO or &

is depended by
CONFIG_CRYPTO_SHA2_ARM_CE