In preparation for removing junit classes from the Android API
the legacy-test target will be removed from the
TARGET_DEFAULT_JAVA_LIBRARIES. This change adds explicit
dependencies on junit and/or legacy-android-test to ensure that
modules will compile properly once it is removed.
Bug: 30188076
Test: make checkbuild
Change-Id: I0f34fe97154240e8f8eef6816df1c794da60351e