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
1 file changed