Add missing coverage for newly-added KeyStore APIs.

Since engineProbe is unimplemented, these APIs are either trivial or not yet functional, so it is not the
most interesting set of tests, but at least they're covered now.

Test: atest CtsLibcoreOjTestCases:test.java.security.KeyStore.ProbeKeystores
Test: atest KeyStoreSpiTest
Bug: 220029542
Bug: 220030323
Bug: 220030389
Change-Id: I1250590ec75aa037406dc3b26537f5cb8047f270
2 files changed