MediaSession2Service: Initial commit

Bug: 122563346
Test: Build
Change-Id: I250ee493837bfa7964fa7baf3d11f1673c879010
diff --git a/Android.bp b/Android.bp
index c202408..2808c35 100644
--- a/Android.bp
+++ b/Android.bp
@@ -476,6 +476,7 @@
         "media/java/android/media/IMediaRouterClient.aidl",
         "media/java/android/media/IMediaRouterService.aidl",
         "media/java/android/media/IMediaSession2.aidl",
+        "media/java/android/media/IMediaSession2Service.aidl",
         "media/java/android/media/IMediaScannerListener.aidl",
         "media/java/android/media/IMediaScannerService.aidl",
         "media/java/android/media/IPlaybackConfigDispatcher.aidl",