ControllerInterface/Android: Implement device population

Source/Core/InputCommon/CMakeLists.txt

@@ -146,6 +146,9 @@ elseif(ANDROID)
     ControllerInterface/Touch/InputOverrider.cpp
     ControllerInterface/Touch/InputOverrider.h
   )
+  target_link_libraries(inputcommon PRIVATE
+    androidcommon
+  )
 endif()
 
 if(NOT ANDROID)

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

Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp

@@ -67,7 +67,7 @@ void ControllerInterface::Initialize(const WindowSystemInfo& wsi)
   m_input_backends.emplace_back(ciface::SDL::CreateInputBackend(this));
 #endif
 #ifdef CIFACE_USE_ANDROID
-// nothing needed
+  ciface::Android::Init();
 #endif
 #ifdef CIFACE_USE_EVDEV
   m_input_backends.emplace_back(ciface::evdev::CreateInputBackend(this));
@@ -237,7 +237,7 @@ void ControllerInterface::Shutdown()
   ciface::Quartz::DeInit();
 #endif
 #ifdef CIFACE_USE_ANDROID
-// nothing needed
+  ciface::Android::Shutdown();
 #endif
 
   // Empty the container of input backends to deconstruct and deinitialize them.