libcamera_metadata: Minor fixes

Add method to get read-only metadata entry by index.
Update some function descriptions to show return values.

Change-Id: Ib79ec1aab8f44f4ee7122fd56064514b2d6f78b4
2 files changed
tree: 629ebd3175786146051e43fd700daf51d5273d51
  1. audio_effects/
  2. audio_route/
  3. audio_utils/
  4. camera/
  5. CleanSpec.mk