X509: Rename X509_set0_sm2_id() and friends

X509: Rename X509_set0_sm2_id() and friends

- X509_set0_sm2_id() -> X509_set0_distinguishing_id()
- X509_get0_sm2_id() -> X509_get0_distinguishing_id()
- X509_REQ_set0_sm2_id -> X509_REQ_set0_distinguishing_id()
- X509_REQ_get0_sm2_id -> X509_REQ_get0_distinguishing_id()

The reason for this rename is that the SM2 ID isn't really a unique
SM2 data item, but rather a re-use of the Distinguished that is
defined in ISO/IEC 15946-3 as well as in FIPS 196, with no special
attribution toward any algorithm in particular.

Fixes #11293

Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
(Merged from https://github.com/openssl/openssl/pull/11302)