Move AES code to Common/Crypto

Source/Core/Common/Crypto/AES.h

@@ -0,0 +1,18 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <cstddef>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+
+namespace Common
+{
+namespace AES
+{
+std::vector<u8> Decrypt(const u8* key, u8* iv, const u8* src, size_t size);
+}  // namespace AES
+}  // namespace Common