assign container name to flag package

Bug: 330354107
Test: CI

Flag: NONE

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

Change-Id: I0b597c73a2f7803f4d704d4302fafb4265e01a35
diff --git a/packages/SettingsProvider/Android.bp b/packages/SettingsProvider/Android.bp
index bf4f60d..a44c793 100644
--- a/packages/SettingsProvider/Android.bp
+++ b/packages/SettingsProvider/Android.bp
@@ -87,6 +87,7 @@
 aconfig_declarations {
     name: "device_config_service_flags",
     package: "com.android.providers.settings",
+    container: "system",
     srcs: [
         "src/com/android/providers/settings/device_config_service.aconfig",
     ],