Fix layout transition from Display->Ambient Display to Gestures

1. Add handling in Gestures settings to scroll to the corresponding
preference when launching from Display->Ambient Display
2. Remove the bitmap creation for the video preview image
3. Use a custom aspect ration framee layout to hold the animation
instead to avoid resizing of the animation view.

Bug: 29795707
Change-Id: I67209ba2508a93da4fc46ff20986309dbe5a83d5