MediaSession2: Move binder interfaces into the updatable

Test: Run all MediaComponents tests once
Change-Id: I159e03156ae5e14c79279c7a30f54e65abbcd097
diff --git a/packages/MediaComponents/Android.mk b/packages/MediaComponents/Android.mk
index 61d73a0..7c7718e 100644
--- a/packages/MediaComponents/Android.mk
+++ b/packages/MediaComponents/Android.mk
@@ -27,7 +27,10 @@
 # TODO: Use System SDK once public APIs are approved
 # LOCAL_SDK_VERSION := system_current
 
-LOCAL_SRC_FILES := $(call all-java-files-under, src)
+LOCAL_SRC_FILES := \
+    $(call all-java-files-under, src) \
+    $(call all-Iaidl-files-under, src)
+
 LOCAL_PROGUARD_FLAG_FILES := proguard.cfg
 
 LOCAL_MULTILIB := first