Support MediaBrowserService in AOSP Music

* Use MediaSession and MediaController to interact between playback
  service and playback applications
* Introduced MusicProvdier to scan music resources on local disk
* Removed unnecessary intents and unused activities
* Disabled playlist add, edit, delete function temporarily

Bug: 34748293
Test: make, playing music, browse through Bluetooth on Carkit
Change-Id: Ic88847aa0b3dd4ef5e13afcb839c78544ac05a2a
diff --git a/Android.mk b/Android.mk
index d2b7691..3e620f3 100644
--- a/Android.mk
+++ b/Android.mk
@@ -3,8 +3,7 @@
 
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_SRC_FILES := $(call all-java-files-under, src) \
-	src/com/android/music/IMediaPlaybackService.aidl
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
 
 LOCAL_PACKAGE_NAME := Music