[Catalyst] Proivde KeyValueStore for "Adaptive brightness"

NO_IFTTT=Ignore test

Bug: 374712065
Flag: com.android.settings.flags.catalyst_screen_brightness_mode
Test: adb shell settings delete/get/put system screen_brightness_mode
Change-Id: I57b72082853493173648d4658d2f225121f68bbf
2 files changed