Add base user restriction enforcement to new brightness

Adds the restriction (flagged) to the policy repository. This
restriction only applies if the flag is on AND there is no restriction
enforced by admin.

Test: atest com.android.systemui.brightness
Test: manual, observe different dialogs in different scenarios
Flag: com.android.systemui.qs_ui_refactor
Flag: com.android.systemui.enforce_brightness_base_user_restriction
Fixes: 333908169
Change-Id: Iaae22dbe327c16a1ad602a0badb2276b854b0563