staging: unisys: visorbus: fix include dependency

Due to include order, the visorbus_private.h file was missing a required
include header visorbus.h. If visorchipset.c or visorbus_main.c ever were
to change the order of the includes for visobus.h and visorbus_private.h,
the code would fail to compile.
Reviewed-by: Sameer Wadgaonkar <sameer.wadgaonkar@unisys.com>
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>

drivers/staging/unisys/visorbus/visorbus_private.h

@@ -21,6 +21,7 @@
 
 #include "controlvmchannel.h"
 #include "vbuschannel.h"
+#include "visorbus.h"
 
 int visorchipset_bus_create(struct visor_device *bus_info);
 void visorchipset_bus_destroy(struct visor_device *bus_info);