Enable coverage for core-oj.

For now, only a whitelisted set of packages are whitelisted (see
libcore/JavaLibrary.bp) but this works as a proof-of-concept.

Bug: 64836607
Test: `cts-tradefed run cts-dev -m CtsLibcoreTestCases --test-arg com.android.compatibility.testtype.LibcoreTest:coverage:true` on a build with EMMA_INSTRUMENT=true and EMMA_INSTRUMENT_FRAMEWORK=true
Change-Id: If7c62665257f0ff9466030680ff1f56a053a023e
diff --git a/java/config/config.go b/java/config/config.go
index c43f9a3..c329123 100644
--- a/java/config/config.go
+++ b/java/config/config.go
@@ -39,6 +39,7 @@
 		"services",
 		"android.car",
 		"android.car7",
+		"core-oj",
 	}
 )