Add LE audio hardware offload development option

Bug: 197296692
Bug: 215492586
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothLeAudioHwOffloadPreferenceControllerTest
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=BluetoothA2dpHwOffloadPreferenceControllerTest

Change-Id: If1203c50d1d94ac9ed377293b5cb389b7b6f54a1
10 files changed