staging: unisys: get rid of list of devices

We don't need the list of devices, we can loop through the one
provided by the network api and filter on ours.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>