Camera: Update SDK metadata key/enum generation

- Flatten Key hierarchy
- Insert Keys into their respective containers instead of separate files
- Use ints instead of Enum types
- Insert enum ints into CameraMetadata
- Add @see cross-references between enum Keys and values.
- Add Javadoc to Keys and enum values.
- Map SCALER_AVAILABLE_FORMATS to int

Bug: 10345522
Change-Id: Ia9762b326b404c572de97c2c7814c4e2e0f3070d
8 files changed
tree: 3c01769692e4083e968692d68e83db0cddb8b9b3
  1. audio_effects/
  2. audio_route/
  3. audio_utils/
  4. camera/
  5. CleanSpec.mk