Changeset 9967 made the qemu serial line Summagraphics support a little
more flexible with respect to the COM line chosen.  This patch
furthers that effort by removing the COM2 restriction.  This patch
allows a "-summa n" command line option to qemu to specify which, if
any, COM port should be using the Summagraphics protocols.

Signed-off-by: Ben Thomas (ben@virtualiron.com)

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Ben Thomas                                         Virtual Iron Software
bthomas@virtualiron.com                            Tower 1, Floor 2
978-849-1214                                       900 Chelmsford Street
                                                    Lowell, MA 01851