set aconfig_declarations containers to system

Bug: 330354107
Test: CI

Flag: NONE

Ignore-AOSP-First: It is easier to detect all the mismatch in internal
master.

Change-Id: Ic1af43cf291fce8845011f083cef21a67bc6aab9
diff --git a/packages/SystemUI/aconfig/Android.bp b/packages/SystemUI/aconfig/Android.bp
index 15c2c17..2a32b58 100644
--- a/packages/SystemUI/aconfig/Android.bp
+++ b/packages/SystemUI/aconfig/Android.bp
@@ -36,6 +36,7 @@
 aconfig_declarations {
     name: "com_android_systemui_flags",
     package: "com.android.systemui",
+    container: "system",
     srcs: [
         "*.aconfig",
     ],