Set default autoframing values

Set default values for autoframing in CaptureRequest, CaptureResult and
CameraCharacteristics. This will also fix
CaptureRequestTest#testAutoframing which is complaining about
autoframingAvailable key being null.

Test: atest CaptureResultTest#testCameraCaptureResultAllKeys,
CaptureRequestTest#testAutoframing
Bug: 259572724

Change-Id: I596abc0bd1e7aa57c4ef1326fe6185695894951c