move dropbox_flags_lib to framework flag list

This change makes dropbox_flags_lib visible to metalava so
metalava won't hide the guarded api.

Since the guarded api are in the framework, this change move this flag
to framework flag list.

Bug: 333995906
Test: lunch sdk-next-eng && m sdk dist and presubmit
Change-Id: I4ae6c4023816d2d4b87a990d949f6094ab6fd7d3
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index d3e80ae..d98e191 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -92,6 +92,7 @@
         "com.android.window.flags.window-aconfig-java",
         "device_policy_aconfig_flags_lib",
         "display_flags_lib",
+        "dropbox_flags_lib",
         "framework-jobscheduler-job.flags-aconfig-java",
         "framework_graphics_flags_java_lib",
         "hwui_flags_java_lib",
@@ -1351,3 +1352,19 @@
     aconfig_declarations: "backstage_power_flags",
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
+
+// Dropbox data
+aconfig_declarations {
+    name: "dropbox_flags",
+    package: "com.android.server.feature.flags",
+    container: "system",
+    srcs: [
+        "services/core/java/com/android/server/feature/dropbox_flags.aconfig",
+    ],
+}
+
+java_aconfig_library {
+    name: "dropbox_flags_lib",
+    aconfig_declarations: "dropbox_flags",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}