MediaSession2: Move MediaSession2/MediaController2 from experimental

APIs will be unhidden later

Test: Run MediaComponentsTest
Change-Id: I4e6f5937baa7e09cf850929e534ac44b5278d744
diff --git a/packages/MediaComponents/Android.mk b/packages/MediaComponents/Android.mk
index bbd2afa..f094f97 100644
--- a/packages/MediaComponents/Android.mk
+++ b/packages/MediaComponents/Android.mk
@@ -59,3 +59,5 @@
 LOCAL_USE_AAPT2 := true
 
 include $(BUILD_PACKAGE)
+
+include $(call all-makefiles-under,$(LOCAL_PATH))