Created systemui/new_picker_ui flag (1/2)

This flag is going to be used in SysUI and Launcher. Thus removed the one in customization_picker and create the new one in systemui.

Test: Build success
Bug: 339081035
Flag: com.android.systemui.new_picker_ui
Change-Id: I908b325f58f6e6ce5312845d55bc4a5f4ef97928
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index e6fae7b..be08fcf 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -1274,6 +1274,13 @@
 }
 
 flag {
+    name: "new_picker_ui"
+    namespace: "systemui"
+    description: "Enables the BC25 design of the customization picker UI."
+    bug: "339081035"
+}
+
+flag {
   namespace: "systemui"
   name: "settings_ext_register_content_observer_on_bg_thread"
   description: "Register content observer in callback flow APIs on background thread in SettingsProxyExt."