staging: unisys: Change enable/disable to wait forever

I don't see why the server should stop responding, or that we should just
give up if it does.  Wait forever when enabling/disabling the visornic

Signed-off-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>