Adding audioUseHalDuckingSignals config

- New config will control whether CarDucking should be initialized
- Also updating CarZonesAudioFocus to support null callback in case
ducking is disabled.
- Added tests for CarZonesAudioFocus constructor

Bug: 158242859
Test: Ran on device and atest CarZonesAudioFocusTest
Change-Id: Ife97c7b87969d7c3ee0c932e660ac3f028c232dc
4 files changed
tree: 5958b1384332b49ed183294ef1255c165443ad2d
  1. car-admin-ui-lib/
  2. car-bugreportd/
  3. car-internal-lib/
  4. car-lib/
  5. car-maps-placeholder/
  6. car-systemtest-lib/
  7. car-test-lib/
  8. car-usb-handler/
  9. car_product/
  10. cpp/
  11. experimental/
  12. FrameworkPackageStubs/
  13. obd2-lib/
  14. packages/
  15. procfs-inspector/
  16. service/
  17. tests/
  18. tools/
  19. user/
  20. vehicle-hal-support-lib/
  21. .clang-format
  22. .gitignore
  23. Android.mk
  24. CleanSpec.mk
  25. CPPLINT.cfg
  26. OWNERS
  27. PREUPLOAD.cfg
  28. README.md
  29. TEST_MAPPING
README.md

Native (C++) code format is required to be compatible with .clang-format file. Run

git clang-format --style=file --extension='h,cpp,cc' HEAD~

Note that clang-format is not desirable for Android java files. Therefore the command line above is limited to specific extensions.