Set the container field of aconfig flags

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

Test: m
Bug: 312769710
Change-Id: I828a1a1c5ab944283341ace924db97c4eadb7a7f
diff --git a/aconfig/Android.bp b/aconfig/Android.bp
index d14cc6f..b2ffa22 100644
--- a/aconfig/Android.bp
+++ b/aconfig/Android.bp
@@ -5,6 +5,7 @@
 aconfig_declarations {
     name: "aconfig_settings_flags",
     package: "com.android.settings.flags",
+    container: "system",
     srcs: [
         "*.aconfig",
     ],
@@ -18,6 +19,7 @@
 aconfig_declarations {
     name: "factory_reset_flags",
     package: "com.android.settings.factory_reset",
+    container: "system",
     srcs: ["factory_reset/*.aconfig"],
 }
 
@@ -29,6 +31,7 @@
 aconfig_declarations {
     name: "media_drm_flags",
     package: "com.android.settings.media_drm",
+    container: "system",
     srcs: ["media_drm/*.aconfig"],
 }
 
@@ -40,6 +43,7 @@
 aconfig_declarations {
     name: "accessibility_flags",
     package: "com.android.settings.accessibility",
+    container: "system",
     srcs: ["accessibility/*.aconfig"],
 }
 
@@ -51,8 +55,9 @@
 aconfig_declarations {
     name: "development_settings_flags",
     package: "com.android.settings.development",
+    container: "system",
     srcs: [
-        "development/**/*.aconfig"
+        "development/**/*.aconfig",
     ],
 }