[aconfig] Refactor WakefulnessLifecyle to PowerInteractor

Part1: Guard WakefulnessLifecycle with flag

Flag: NONE
Test: Unit tests / Manual
Bug: 331451011
Change-Id: Idec75be8f236c53469f8ef70185db779e8e12649
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 16bc7f2..968879a 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -525,6 +525,13 @@
 }
 
 flag {
+   name: "smartspace_lockscreen_viewmodel"
+   namespace: "systemui"
+   description: "Indicate Smartspace lockscreen viewmodel"
+   bug: "331451011"
+}
+
+flag {
    name: "pin_input_field_styled_focus_state"
    namespace: "systemui"
    description: "Enables styled focus states on pin input field if keyboard is connected"