Reference core-test-rules in MtsConscryptTestCases

Making core-test-rules visible to MtsConscryptTestCases since it fails
to find EnableDeprecatedBouncyCastleAlgorithmsRule type.

Test: atest MtsConscryptTestCases
Bug: 148097409
Change-Id: I1cfba6ebb44b2d39ce63bbaea142432b6528f497
diff --git a/JavaLibrary.bp b/JavaLibrary.bp
index 407b30f..e5e2a69 100644
--- a/JavaLibrary.bp
+++ b/JavaLibrary.bp
@@ -486,6 +486,7 @@
     visibility: [
         "//art/build/sdk",
         "//external/conscrypt",
+        "//external/conscrypt/apex/tests",
         "//frameworks/base/location/tests/locationtests",
         "//frameworks/base/core/tests/coretests",
         "//frameworks/base/wifi/tests",