Android: Add new input mapping implementation

Source/Android/jni/Input/ControlReference.h

@@ -0,0 +1,11 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <jni.h>
+
+class ControlReference;
+
+jobject ControlReferenceToJava(JNIEnv* env, ControlReference* control_reference);
+ControlReference* ControlReferenceFromJava(JNIEnv* env, jobject control_reference);