Migrate LIGHT_REVEAL_MIGRATION to aconfig

Test: NONE
Bug: b/281655028
Flag: ACONFIG com.android.systemui.Flags.FLAG_LIGHT_REVEAL_MIGRATION DEVELOPMENT
Change-Id: I68f6241c189b135be4fade14dbda6c131903610e
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index d0b471a..4cb3603 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -126,4 +126,11 @@
     namespace: "systemui"
     description: "New LOCKSCREEN <=> AOD transition"
     bug: "301915812"
+}
+
+flag {
+    name: "light_reveal_migration"
+    namespace: "systemui"
+    description: "Move LightRevealScrim to recommended architecture"
+    bug: "281655028"
 }
\ No newline at end of file