* cipher/ecc.c: Factor out data for ECC selftests.
(selftest_hash_sign, selftest_sign): Have more arguments.
(selftests_ecc): Rename from selftests_ecdsa, having more args.
Follow the change of selftest_hash_sign, selftest_sign with data.
(run_selftests): Call selftests_ecc with constants of ECDSA.