g10: Remove deprecated internal functions.
* g10/keygen.c (do_ask_passphrase, generate_raw_key) (gen_card_key_with_backup, save_unprotected_key_to_card): Remove.
Now, key generation is done by gpg-agent. Asking passphrase is done
through pinentry invoked by gpg-agent. It is done by
new internal function of card_store_key_with_backup.