drivers: staging: unisys: add MODULE_DEVICE_TABLE and temporary MODULE_ALIAS lines to visornic

This patch adds an module alias and a MODULE_DEVICE_TABLE to autoload the
visornic driver when an appropriate device is created by the visorbus.

Note, the correct way of fixing this is adding functionality to
scripts/mod/file2alias.c for the visorbus bus type.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>