CMP: generalize ossl_cmp_calc_protection() to handle Edwards curves correctly

Fixes #21564

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@open

CMP: generalize ossl_cmp_calc_protection() to handle Edwards curves correctly

Fixes #21564

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21884)

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