Add flag for VDM settings

Change-Id: I1bb9bd6cb276c763c3101b7c01369bb411282dd9
Test: presubmit
Flag: android.companion.virtualdevice.flags.vdm_settings
Bug: 338974320
diff --git a/core/java/android/companion/virtual/flags/flags.aconfig b/core/java/android/companion/virtual/flags/flags.aconfig
index 9af2016..c47fe23 100644
--- a/core/java/android/companion/virtual/flags/flags.aconfig
+++ b/core/java/android/companion/virtual/flags/flags.aconfig
@@ -153,3 +153,10 @@
     bug: "371173368"
     is_exported: true
 }
+
+flag {
+    name: "vdm_settings"
+    namespace: "virtual_devices"
+    description: "Show virtual devices in Settings"
+    bug: "338974320"
+}