staging: unisys: visorbus: Update vmcallinterface comment

The comment at the beginning of the vmcallinterface.h file references IO
Virtualization. It should be more specific that it is referencing s-Par
Virtualization.
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorbus/vmcallinterface.h

@@ -16,9 +16,9 @@
 #define __VMCALLINTERFACE_H__
 
 /*
- * This file contains all structures needed to support the VMCALLs for IO
- * Virtualization.  The VMCALLs are provided by Monitor and used by IO code
- * running on IO Partitions.
+ * This file contains all structures needed to support the VMCALLs for s-Par
+ * Virtualization.  The VMCALLs are provided by Monitor and used by s-Par
+ * drivers running in a Linux guest partition.
  */
 static inline unsigned long
 __unisys_vmcall_gnuc(unsigned long tuple, unsigned long reg_ebx,