staging: unisys: visorbus: to_visor_device/to_visor_driver move up

The macros to_visor_device and to_visor_driver are fairly small; move them
up to the declaration block to save some space.

Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>