Rename a2dp impl as mock.

So that it isn't accidentally used.

Bug: 140115084
Test: codesearching for usages
Change-Id: I2736a875d8a3021ce496847c45259f10aa148bc0
diff --git a/bluetooth/a2dp/1.0/default/Android.bp b/bluetooth/a2dp/1.0/default/Android.bp
index 8e6f32d..c4ef0d7 100644
--- a/bluetooth/a2dp/1.0/default/Android.bp
+++ b/bluetooth/a2dp/1.0/default/Android.bp
@@ -1,5 +1,5 @@
 cc_library_shared {
-    name: "android.hardware.bluetooth.a2dp@1.0-impl",
+    name: "android.hardware.bluetooth.a2dp@1.0-impl.mock",
     relative_install_path: "hw",
     vendor: true,
     srcs: [