[apkverify] Enable apk verification with ECDSA with SHA2-512 digest

This CL implements one missing signature algorithm ECDSA with
SHA2-512 digest.

Bug: 197052981
Test: libapkverify.integration_test
Change-Id: I1c31a2af5672f6a52183cb3f65cb057a3dcf51bc
diff --git a/libs/apkverify/tests/apkverify_test.rs b/libs/apkverify/tests/apkverify_test.rs
index 7e1438f..3818259 100644
--- a/libs/apkverify/tests/apkverify_test.rs
+++ b/libs/apkverify/tests/apkverify_test.rs
@@ -56,9 +56,7 @@
 #[test]
 fn test_verify_v3_ecdsa_sha512() {
     for key_name in KEY_NAMES_ECDSA.iter() {
-        let res = verify(format!("tests/data/v3-only-with-ecdsa-sha512-{}.apk", key_name));
-        assert!(res.is_err());
-        assert_contains(&res.unwrap_err().to_string(), "not implemented");
+        assert!(verify(format!("tests/data/v3-only-with-ecdsa-sha512-{}.apk", key_name)).is_ok());
     }
 }