Let's not use hvc0 as the dom0 console device.

I was having to hack grub.cfg to make this work anyway since I don't know
how to properly configure /etc/default/grub to use ttyS0 for regular Linux
and hvc0 for Linux under Xen.

This change would mess up the console on Xen 4.1 and Xen 4.3 image too.

clientside/tmcc/linux/xen/init/hvc0.conf

-# hvc0 - getty on Xen virtual console
-#
-# This service maintains a getty on hvc0 from the point the system is
-# started until it is shut down again.
-
-start on stopped rc RUNLEVEL=[2345]
-stop on runlevel [!2345]
-
-respawn
-exec /sbin/getty -L hvc0 115200 vt102

clientside/tmcc/linux/xen/init/ttyS0.override

-manual