sm4-aarch64-sve: clear volatile vectors registers
* cipher/asm-common-aarch64.h (CLEAR_ALL_REGS): New. * cipher/sm4-armv9-aarch64-sve-ce.S (_gcry_sm4_armv9_sve_ce_cbc_dec, _gcry_sm4_armv9_sve_ce_cfb_dec) (_gcry_sm4_armv9_sve_ce_ctr_enc): Add CLEAR_ALL_REGS.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>