[WDF] Add Windows Driver Framework files

Takern from Microsoft GitHub repo:
d9c6040fe9

Licensed under MIT

sdk/lib/drivers/wdf/shared/object/fxobjectpch.hpp

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+/*++
+
+Copyright (c) Microsoft. All rights reserved.
+
+Module Name:
+
+   fxobjectpch.h
+
+Abstract:
+
+    This module contains header definitions and include files needed by all
+    modules in shared\object
+
+Author:
+
+Environment:
+   Both kernel and user mode
+
+Revision History:
+
+--*/
+
+#ifndef __FX_CORE_PCH_H__
+#define __FX_CORE_PCH_H__
+
+#include "objectpriv.hpp"
+#include "fxmin.hpp"
+#include "FxToObjectItf.hpp"
+
+#endif // __FX_CORE_PCH_H__