Use SessionPlaylistAgent in MediaSession2Impl

Bug: 74090741
Test: SessionPlaylistAgentTest
Change-Id: I9ea059f99e940f71f173ae5d0248253a26292304
diff --git a/packages/MediaComponents/tests/Android.mk b/packages/MediaComponents/tests/Android.mk
index bf81efb..dddfd2a 100644
--- a/packages/MediaComponents/tests/Android.mk
+++ b/packages/MediaComponents/tests/Android.mk
@@ -20,6 +20,7 @@
 LOCAL_STATIC_JAVA_LIBRARIES := \
     android.test.runner.stubs \
     android.test.base.stubs \
+    mockito-target-minus-junit4 \
     junit
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)