Move virtual_camera_service_discovery flag to virtual_devices namespace

... and config owned by Virtual Device Manager team.

Bug: 311459626
Test: atest CameraProviderManagerTest
Change-Id: Ie037578f1da39d8409a95b12064d4d0aea313856
diff --git a/services/camera/libcameraservice/Android.bp b/services/camera/libcameraservice/Android.bp
index af4c70c..c79270f 100644
--- a/services/camera/libcameraservice/Android.bp
+++ b/services/camera/libcameraservice/Android.bp
@@ -73,6 +73,7 @@
         "libstagefright_foundation",
         "libxml2",
         "libyuv",
+        "android.companion.virtualdevice.flags-aconfig-cc",
         "android.hardware.camera.common@1.0",
         "android.hardware.camera.device@1.0",
         "android.hardware.camera.device@3.2",