driver-only ECDSA: get testing parity in X.509

[mpg]

Context: #6839.

This task is to finish off TL-ecdsa.X509 by achieving testing parity in the X.509 test suites. Once it's done, in analyze_outcomes.py, the task analyze_driver_vs_reference_ecdsa will no longer ignore x509parse nor x509write.

This will likely consist of replacing uses of MBEDTLS_ECDSA_C with the relevant macros defined in #6857 in the right places.

For info functions, we may want to change the output format when USE_PSA is enabled.

Note: since this modifies dependency declarations, we'll want to use docs/architecture/psa-migration/outcome-analysis.sh on the PR that implements this.

Depends on: #6857