Prepare for removal of legacy-test from default targets (Part 2)

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
Merged-In: If507b641624a2933e722f61e815890fcdf442265
Change-Id: Icdcad50f1cc32e900bc9e882f1db2867ea170fbf