Add system service for music recognition.

The client submits a RecognitionRequest via MusicRecognitionManager.  System server opens an audio stream based on the request and sends it to a MusicRecognitionService (which is exposed by a system app).  The result is passed back through system server to the original caller.

Test: tracked in b/169662646
Bug: 169403302
Change-Id: I4c7fd9d9d72ddd5678867fd037cab6198bff2c2d
diff --git a/services/Android.bp b/services/Android.bp
index ef52c2a..d3577ef 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -28,6 +28,7 @@
         ":services.coverage-sources",
         ":services.devicepolicy-sources",
         ":services.midi-sources",
+        ":services.musicsearch-sources",
         ":services.net-sources",
         ":services.print-sources",
         ":services.profcollect-sources",
@@ -71,6 +72,7 @@
         "services.coverage",
         "services.devicepolicy",
         "services.midi",
+        "services.musicsearch",
         "services.net",
         "services.people",
         "services.print",