sm4-aarch64-ce: clear volatile vector registers
* cipher/sm4-armv8-aarch64-ce.S (_gcry_sm4_armv8_ce_expand_key) (_gcry_sm4_armv8_ce_crypt_blk1_8, _gcry_sm4_armv8_ce_crypt) (_gcry_sm4_armv8_ce_cbc_dec, _gcry_sm4_armv8_ce_cfb_dec) (_gcry_sm4_armv8_ce_ctr_enc, _gcry_sm4_armv8_ce_xts_crypt): Add CLEAR_ALL_REGS.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>