Move virtual_camera_service_discovery to virtual_devices namespace

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

This cl creates new flags.aconfig since the previously used
core/java/android/companion/virtual/flags.aconfig has package
which contains "virtual" C++ keyword so it's not possible to
add cc target due to compilation error in autogenerated code.

Bug: 311459626
Test: atest CameraProviderManagerTest
Change-Id: Id7c60cf4b1eaed2a9b65bcb34f193cab05639953
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index b5f398b..501277e 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -263,6 +263,23 @@
 }
 
 // VirtualDeviceManager
+cc_aconfig_library {
+    name: "android.companion.virtualdevice.flags-aconfig-cc",
+    aconfig_declarations: "android.companion.virtualdevice.flags-aconfig",
+}
+
+java_aconfig_library {
+    name: "android.companion.virtualdevice.flags-aconfig-java",
+    aconfig_declarations: "android.companion.virtualdevice.flags-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}
+
+aconfig_declarations {
+    name: "android.companion.virtualdevice.flags-aconfig",
+    package: "android.companion.virtualdevice.flags",
+    srcs: ["core/java/android/companion/virtual/flags/*.aconfig"],
+}
+
 java_aconfig_library {
     name: "android.companion.virtual.flags-aconfig-java",
     aconfig_declarations: "android.companion.virtual.flags-aconfig",