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

AconfigFlags.bp

@@ -263,6 +263,23 @@ java_aconfig_library {
 }
 
 // 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",

core/java/android/companion/virtual/flags.aconfig

+# Do not add new flags to this file.
+#
+# Due to "virtual" keyword in the package name flags
+# added to this file cannot be accessed from C++
+# code.
+#
+# Use frameworks/base/core/java/android/companion/virtual/flags/flags.aconfig
+# instead.
+
 package: "android.companion.virtual.flags"
 
 flag {

core/java/android/companion/virtual/flags/flags.aconfig

+#
+# Copyright (C) 2023 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+package: "android.companion.virtualdevice.flags"
+
+flag {
+     namespace: "virtual_devices"
+     name: "virtual_camera_service_discovery"
+     description: "Enable discovery of the Virtual Camera HAL without a VINTF entry"
+     bug: "305170199"
+}