LINUXKM_LKCAPI_NEED_AES_SKCIPHER_COMMON_FUNCS helper macros (peer review
suggestion).
wolfcrypt/src/aes.c: add lengthy comment in software wc_AesSetKeyLocal()
explaining the dynamics of aes->use_aesni (peer review suggestion), and in the
!haveAESNI && WC_C_DYNAMIC_FALLBACK case, return with immediate success rather
than following through to the redundant AesSetKey_C().