Migrate keyguard+WM refactor flag to aconfig.

It's time.

Test: atest SystemUITests
Bug: 278086361
Flag: NA
Change-Id: I1b9689fa0402e9cd433839ea0b47365e51ae4024
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 3236130..d5278a7 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -357,3 +357,10 @@
    description: "Enables styled focus states on pin input field if keyboard is connected"
    bug: "316106516"
 }
+
+flag {
+    name: "keyguard_wm_state_refactor"
+    namespace: "systemui"
+    description: "Enables refactored logic for SysUI+WM unlock/occlusion code paths"
+    bug: "278086361"
+}