[openssl/openssl] 5d8c9e: Add SM2 support for EVP_PKEY_Q_keygen

[Jiaxun Yang]

  Branch: refs/heads/openssl-3.1
  Home:   https://github.com/openssl/openssl
  Commit: 5d8c9e2c28fb973b842e88105eb618d0254b42af
      https://github.com/openssl/openssl/commit/5d8c9e2c28fb973b842e88105eb618d0254b42af
  Author: Jiaxun Yang <jiaxun.yang at flygoat.com>
  Date:   2022-11-24 (Thu, 24 Nov 2022)

  Changed paths:
    M crypto/evp/evp_lib.c
    M doc/man3/EVP_PKEY_keygen.pod

  Log Message:
  -----------
  Add SM2 support for EVP_PKEY_Q_keygen

There is no reason preventing this API to support SM2,
which gives us a simple method to do SM2 key gen.

CLA: trivial

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19736)

(cherry picked from commit 3f32d29ad464591ed968a1e430111e1525280f4c)