Prepare for removal of legacy-test from default targets

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: I13e88297731253420e4e5f5291d503f13a39a156
diff --git a/packages/SystemUI/tests/Android.mk b/packages/SystemUI/tests/Android.mk
index e96ea19..c627e22 100644
--- a/packages/SystemUI/tests/Android.mk
+++ b/packages/SystemUI/tests/Android.mk
@@ -46,7 +46,8 @@
     android-support-test \
     mockito-updated-target-minus-junit4 \
     SystemUI-proto \
-    SystemUI-tags
+    SystemUI-tags \
+    legacy-android-test
 
 LOCAL_JAVA_LIBRARIES := android.test.runner telephony-common android.car