Add missing headers containing forward references of MM routines

sdk/xtdk/amd64/mmfuncs.h

@@ -0,0 +1,20 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            sdk/xtdk/amd64/mmfuncs.h
+ * DESCRIPTION:     Memory manager routines specific to AMD64 architecture
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#ifndef __XTDK_AMD64_MMFUNCS_H
+#define __XTDK_AMD64_MMFUNCS_H
+
+#include <xtbase.h>
+
+
+XTFASTCALL
+VOID
+MmZeroPages(IN PVOID Address,
+            IN ULONG Size);
+
+#endif /* __XTDK_AMD64_MMFUNCS_H */