* cipher/Makefile.am: Add 'sha256-riscv-zvknha-zvkb.c' and
'sha512-riscv-zvknhb-zvkb.c'.
* cipher/sha256-riscv-zvknha-zvkb.c: New.
* cipher/sha256.c (USE_RISCV_V_CRYPTO): New.
[USE_RISCV_V_CRYPTO] (_gcry_sha256_riscv_v_check_hw)
(_gcry_sha256_transform_riscv_zvknha_zvkb)
(do_sha256_transform_riscv_zvknha): New.
(sha256_common_init) [sha256_common_init]: Enable new implementation
if supported by HW.
* cipher/sha512-riscv-zvknhb-zvkb.c: New.
* cipher/sha512.c (USE_RISCV_V_CRYPTO): New.
[USE_RISCV_V_CRYPTO] (_gcry_sha512_riscv_v_check_hw)
(_gcry_sha512_transform_riscv_zvknhb_zvkb)
(do_sha512_transform_riscv_zvknhb): New.
(sha512_common_init) [sha512_common_init]: Enable new implementation
if supported by HW.
* configure.ac: Add 'sha256-riscv-zvknha-zvkb.lo' and
'sha512-riscv-zvknhb-zvkb.lo'.
(GCRY_RISCV_VECTOR_INTRINSICS_TEST): New.
(gcry_cv_cc_riscv_vector_intrinsics)
(gcry_cv_cc_riscv_vector_intrinsics_cflags): Move test code to new
macro GCRY_RISCV_VECTOR_INTRINSICS_TEST.
(GCRY_RISCV_VECTOR_CRYPTO_INTRINSICS_TEST)
(gcry_cv_cc_riscv_vector_crypto_intrinsics)
(gcry_cv_cc_riscv_vector_crypto_intrinsics_cflags)
(gcry_cv_riscv_vsha2cl_intrinsics_work): New.
* src/g10lib.h [HAVE_CPU_ARCH_RISCV] (HWF_RISCV_ZVKB, HWF_RISCV_ZVKNHA)
(HWF_RISCV_ZVKNHB): New.
* src/hwf-riscv.c (HWF_RISCV_HWPROBE_EXT_ZVKB)
(HWF_RISCV_HWPROBE_EXT_ZVKNHA, HWF_RISCV_HWPROBE_EXT_ZVKNHB): New.
* src/hwfeatures.c (hwflist) [HAVE_CPU_ARCH_RISCV]: Add "riscv-zvkb",
"riscv-zvknha" and "riscv-zvknhb".