staging: hv: hv_utils depends on CONNECTOR

Don't build hv_utils when CONFIG_CONNECTOR is not enabled.
Fixes these build errors:

ERROR: "cn_add_callback" [drivers/staging/hv/hv_utils.ko] undefined!
ERROR: "cn_del_callback" [drivers/staging/hv/hv_utils.ko] undefined!
ERROR: "cn_netlink_send" [drivers/staging/hv/hv_utils.ko] undefined!
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/Kconfig

@@ -31,6 +31,7 @@ config HYPERV_NET
 
 config HYPERV_UTILS
 	tristate "Microsoft Hyper-V Utilities driver"
+	depends on CONNECTOR
 	default HYPERV
 	help
 	  Select this option to enable the Hyper-V Utilities.