sm4: fix use of GFNI/AVX2 accelerated key expansion
* cipher/sm4.c [USE_GFNI_AVX2] (_gcry_sm4_gfni_avx_expand_key): Remove. [USE_GFNI_AVX2] (_gcry_sm4_gfni_avx2_expand_key): New. (sm4_expand_key): Change '_gcry_sm4_gfni_avx_expand_key' to '_gcry_sm4_gfni_avx2_expand_key'.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>