tools/ocaml/libs/mmap: Clean up unused read/write

Xenmmap is only modified by the ring functions,
these functions are unused.

Signed-off-by: Edwin Török <edvin.torok@citrix.com>
Message-Id: <9bfd0989994953f08142d26cbe5a22651a1faa2a.1620755943.git.edvin.torok@citrix.com>
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