set container for aconfig package

Bug: 330354107
Test: CI

Flag: NONE

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

Change-Id: Ie52c00f15ab65fb1203fa52febd6259b9954f59c
diff --git a/packages/SettingsLib/aconfig/settingslib.aconfig b/packages/SettingsLib/aconfig/settingslib.aconfig
index 54c5a14..e09ab00 100644
--- a/packages/SettingsLib/aconfig/settingslib.aconfig
+++ b/packages/SettingsLib/aconfig/settingslib.aconfig
@@ -1,4 +1,5 @@
 package: "com.android.settingslib.flags"
+container: "system"
 
 flag {
     name: "new_status_bar_icons"
diff --git a/packages/SettingsLib/aconfig/settingslib_media_flag_declarations.aconfig b/packages/SettingsLib/aconfig/settingslib_media_flag_declarations.aconfig
index f3e537b..4d70aec 100644
--- a/packages/SettingsLib/aconfig/settingslib_media_flag_declarations.aconfig
+++ b/packages/SettingsLib/aconfig/settingslib_media_flag_declarations.aconfig
@@ -1,4 +1,5 @@
 package: "com.android.settingslib.media.flags"
+container: "system"
 
 flag {
   name: "use_media_router2_for_info_media_manager"