BtAudio: Add AIDL loader entry

Bug: 203490261
Test: m android.hardware.bluetooth.audio-V1-impl
Change-Id: I3a952bd8849e6d8c6b26793570e56ae5bf4bba4d
diff --git a/bluetooth/audio/aidl/default/Android.bp b/bluetooth/audio/aidl/default/Android.bp
index 846702f..55f1423 100644
--- a/bluetooth/audio/aidl/default/Android.bp
+++ b/bluetooth/audio/aidl/default/Android.bp
@@ -19,6 +19,7 @@
         "HearingAidAudioProvider.cpp",
         "LeAudioOffloadAudioProvider.cpp",
         "LeAudioSoftwareAudioProvider.cpp",
+        "service.cpp",
     ],
     export_include_dirs: ["."],
     header_libs: ["libhardware_headers"],