Staging: unisys: visorutil: Add MODULE_LICENSE("GPL")

The visorutil module was lacking license info.
Signed-off-by: NKen Cox <jkc@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorutil/visorkmodutils.c

@@ -123,3 +123,4 @@ visorutil_mod_exit(void)
 module_init(visorutil_mod_init);
 module_exit(visorutil_mod_exit);
 
+MODULE_LICENSE("GPL");