Enforce BaseUserRestriction for DISALLOW_CONFIG_BRIGHTNESS

Bug: 329205638
Test: pm set-user-restriction --user 0 no_config_brightness 1
Flag: ACONFIG com.android.systemui.enforce_brightness_base_user_restriction DEVELOPMENT
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f9f3fdba4b4995b0ca45732b95de64318642e210)
Merged-In: I47b8b72a5a5c4098b46f0b5dbbf0654513b03aee
Change-Id: I47b8b72a5a5c4098b46f0b5dbbf0654513b03aee