Allow DeviceConfig to change display settings for high zone

Allow DeviceConfig to change the high zone behavior including
refresh rate and brightness thresholds.

Bug: 166581675
Test: atest DisplayModeDirectorTest
Test: adb shell device_config put display_manager refresh_rate_in_high_zone "90"
Test: adb shell device_config put display_manager fixed_refresh_rate_high_display_brightness_thresholds "200"
Test: adb shell device_config put display_manager fixed_refresh_rate_high_ambient_brightness_thresholds "8000"
Change-Id: I2ac8d95f976748d03f6dc2e60725e9ef1213ed6f