Adjust services robotest makefile

In preparation for transport-related tests needed to make those fixes so
that Mockito annotations would work.

1. Switched from mockito-target-minus-junit4 to
mockito-robolectric-prebuilt. Otherwise we would get dexcache == null
error (similar to
https://groups.google.com/a/google.com/forum/#!topic/robolectric-users/gV0_59Kj2ME/discussion)

2. Removed unused frameworks-base-testutils because it included the
ill-suited mockito dependency (as per 1).

3. Tidied up by moving test dependencies to actual test target.

Test: make RunFrameworksServicesRoboTests
Change-Id: Idd4f13a9aa0327d74b58361ad02aa3313d30ac99
diff --git a/services/robotests/Android.mk b/services/robotests/Android.mk
index 322b891..59d2a24 100644
--- a/services/robotests/Android.mk
+++ b/services/robotests/Android.mk
@@ -26,13 +26,8 @@
 LOCAL_PRIVILEGED_MODULE := true
 
 LOCAL_STATIC_JAVA_LIBRARIES := \
-    frameworks-base-testutils \
     services.backup \
-    services.core \
-    android-support-test \
-    mockito-target-minus-junit4 \
-    platform-test-annotations \
-    truth-prebuilt
+    services.core
 
 include $(BUILD_PACKAGE)
 
@@ -45,6 +40,9 @@
 
 # Include the testing libraries (JUnit4 + Robolectric libs).
 LOCAL_STATIC_JAVA_LIBRARIES := \
+    android-support-test \
+    mockito-robolectric-prebuilt \
+    platform-test-annotations \
     truth-prebuilt
 
 LOCAL_JAVA_LIBRARIES := \