Add libopus to Bluetooth mainline module Apex

This CL includes libopus as a static object within Bluetooth Apex to
enable support for Opus over A2DP.

Bug: 226441860
Test: Sink device using bds-dev

Change-Id: Ie3864f47b1be11d0f34eaf63e5cc82824d4f1e9f
diff --git a/Android.bp b/Android.bp
index 270d327..f2f09f8 100644
--- a/Android.bp
+++ b/Android.bp
@@ -383,6 +383,7 @@
     apex_available: [
         "//apex_available:platform", // used by libstagefright_soft_opusdec
         "com.android.media.swcodec",
+        "com.android.bluetooth",
     ],
     min_sdk_version: "29",
 }