- RSA was missing the MBEDTLS_ prefix.
- DH needs the same temporary fix (prefix + suffix) for now.
- hack_dependencies_not_implemented() needs to ignore MBEDTLS_PSA_WANT
dependencies.
While at it, make the code currently used for ECC more generic, so that
it's ready to be used for RSA and DH in the near future.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>