* cipher/Makefile.am: Add 'sm4-armv9-aarch64-sve-ce.S'.
* cipher/sm4-armv9-aarch64-sve-ce.S: New.
* cipher/sm4.c (USE_ARM_SVE_CE): New.
(SM4_context) [USE_ARM_SVE_CE]: Add 'use_arm_sve_ce'.
(_gcry_sm4_armv9_sve_ce_crypt, _gcry_sm4_armv9_sve_ce_ctr_enc)
(_gcry_sm4_armv9_sve_ce_cbc_dec, _gcry_sm4_armv9_sve_ce_cfb_dec)
(sm4_armv9_sve_ce_crypt_blk1_16): New.
(sm4_setkey): Enable ARMv9 SVE CE if supported by HW.
(sm4_get_crypt_blk1_16_fn) [USE_ARM_SVE_CE]: Add ARMv9 SVE CE
bulk functions.
(_gcry_sm4_ctr_enc, _gcry_sm4_cbc_dec, _gcry_sm4_cfb_dec)
[USE_ARM_SVE_CE]: Add ARMv9 SVE CE bulk functions.
* configure.ac: Add 'sm4-armv9-aarch64-sve-ce.lo'.