sm4-aarch64: clear volatile vectors registers
* cipher/sm4-aarch64.S (clear_volatile_vec_regs): New. (_gcry_sm4_aarch64_crypt_blk1_8, _gcry_sm4_aarch64_crypt) (_gcry_sm4_aarch64_cbc_dec, _gcry_sm4_aarch64_cfb_dec) (_gcry_sm4_aarch64_ctr_enc): Add clear_volatile_vec_regs.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>