Set the container field of aconfig flags

Please see go/aconfig-flag-containers for more context

Test: m
Bug: 312769710
Change-Id: I51e76bd720981862a237d5e548887cd84dee92da
diff --git a/flags/Android.bp b/flags/Android.bp
index 386831c..3497db8 100644
--- a/flags/Android.bp
+++ b/flags/Android.bp
@@ -21,23 +21,23 @@
 aconfig_declarations {
     name: "telecom_flags",
     package: "com.android.server.telecom.flags",
+    container: "system",
     srcs: [
-      "telecom_broadcast_flags.aconfig",
-      "telecom_ringer_flag_declarations.aconfig",
-      "telecom_api_flags.aconfig",
-      "telecom_call_filtering_flags.aconfig",
-      "telecom_incallservice_flags.aconfig",
-      "telecom_default_phone_account_flags.aconfig",
-      "telecom_callaudioroutestatemachine_flags.aconfig",
-      "telecom_call_flags.aconfig",
-      "telecom_calls_manager_flags.aconfig",
-      "telecom_anomaly_report_flags.aconfig",
-      "telecom_callaudiomodestatemachine_flags.aconfig",
-      "telecom_calllog_flags.aconfig",
-      "telecom_resolve_hidden_dependencies.aconfig",
-      "telecom_bluetoothroutemanager_flags.aconfig",
-      "telecom_work_profile_flags.aconfig",
-      "telecom_connection_service_wrapper_flags.aconfig",
+        "telecom_broadcast_flags.aconfig",
+        "telecom_ringer_flag_declarations.aconfig",
+        "telecom_api_flags.aconfig",
+        "telecom_call_filtering_flags.aconfig",
+        "telecom_incallservice_flags.aconfig",
+        "telecom_default_phone_account_flags.aconfig",
+        "telecom_callaudioroutestatemachine_flags.aconfig",
+        "telecom_call_flags.aconfig",
+        "telecom_calls_manager_flags.aconfig",
+        "telecom_anomaly_report_flags.aconfig",
+        "telecom_callaudiomodestatemachine_flags.aconfig",
+        "telecom_calllog_flags.aconfig",
+        "telecom_resolve_hidden_dependencies.aconfig",
+        "telecom_bluetoothroutemanager_flags.aconfig",
+        "telecom_work_profile_flags.aconfig",
+        "telecom_connection_service_wrapper_flags.aconfig",
     ],
 }
-