Add initial code for AFP Mounter CDev.

This code tries to call EasyMount using the request procedure documented in its ERS, but it turns out that doesn't work. The request procedure trashes its return address on the stack, so it crashes whenever you call it.

cdevutil.h

@@ -0,0 +1,6 @@
+#ifndef CDEVUTIL_H
+#define CDEVUTIL_H
+
+void FreeAllCDevMem(void);
+
+#endif