Add ambientLightHorizon to DDC

Add ambientLightHorizonLong and ambientLightHorizonShort to the
DisplayDeviceConfig. These values were previously hardcoded, we can now
adjust them per display. The fallback is still the original hardcoded
value.

Bug: 204251622
Test: adb shell dumpsys display | grep -i horizon
Test: atest AutomaticBrightnessControllerTest

Change-Id: Id6960c8117c4c981f74f883af35b2f8fbf171367