Change MIGRATE_CLOCKS_TO_BLUEPRINT to aconfig

Flag: ACONFIG com.android.systemui.migrate_clocks_to_blueprint
DEVELOPMENT
Bug: 310989341
Test: manual

Change-Id: Ifc95b29be76fbcc9e3d30b3bd5aa20b20c93628f
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index d8d3f87..f8b6419 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -189,6 +189,14 @@
 }
 
 flag {
+   name: "migrate_clocks_to_blueprint"
+   namespace: "systemui"
+   description: "Move clock related views from KeyguardStatusView to KeyguardRootView, "
+        "and use modern architecture for lockscreen clocks"
+   bug: "301502635"
+}
+
+flag {
    name: "fast_unlock_transition"
    namespace: "systemui"
    description: "Faster wallpaper unlock transition"