Add support for Opus in BT Java Service

This CL adds Opus to the BluetoothCodecConfig, and sets the codec as the
default low latency codec.

Bug: 226441860
Test: A2dpCodecConfigTest BluetoothCodecConfigTest A2dpStateMachineTest
Tag: #feature
Ignore-AOSP-First: TM QPR1 Feature

Change-Id: Id94a7f8fab1a7f5e0199d757a70ff19010694fff