staging: unisys: remove visorutil from top level Makefile

The visorutil directory is still mentioned in the top level makefile for
the Unisys drivers, so remove it.
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/Makefile

 #
 # Makefile for Unisys SPAR drivers
 #
-obj-$(CONFIG_UNISYS_VISORUTIL)		+= visorutil/
 obj-$(CONFIG_UNISYS_VISORBUS)		+= visorbus/