ControllerInterface/Android: Implement device population

Source/Core/InputCommon/ControllerInterface/Android/Android.h

@@ -1,9 +1,13 @@
-// Copyright 2008 Dolphin Emulator Project
+// Copyright 2021 Dolphin Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
 namespace ciface::Android
 {
+void Init();
+void Shutdown();
+
 void PopulateDevices();
+
 }  // namespace ciface::Android