default or selected kernelversion does not have config value CONFIG_CRYPTO_SHA256_PPC_SPE.
Result is shown for kernelversion 6.9.9

SHA224 and SHA256 digest algorithm (PPC SPE)

modulename: sha256-ppc-spe.ko

configname: CONFIG_CRYPTO_SHA256_PPC_SPE

Linux Kernel Configuration
└─>Cryptographic API
└─>SHA224 and SHA256 digest algorithm (PPC SPE)
In linux kernel since version 3.10 (release Date: 2013-06-30)  
SHA224 and SHA256 secure hash standard (DFIPS 180-2)
implemented using powerpc SPE SIMD instruction set.

source code:
arch/powerpc/crypto/