driver core: Change delimiter in devlink device's name to "--"

The devlink device name is of the form "supplier:consumer". But ":" is
fairly common in device names and makes it visually hard to distinguish
supplier and consumer. So, replace it with "--" to make it easier.
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20200724180523.1393383-1-saravanak@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ABI/testing/sysfs-class-devlink

@@ -4,7 +4,7 @@ Contact:	Saravana Kannan <saravanak@google.com>
 Description:
 		Provide a place in sysfs for the device link objects in the
 		kernel at any given time.  The name of a device link directory,
-		denoted as ... above, is of the form <supplier>:<consumer>
+		denoted as ... above, is of the form <supplier>--<consumer>
 		where <supplier> is the supplier device name and <consumer> is
 		the consumer device name.
 

drivers/base/core.c

@@ -623,7 +623,7 @@ struct device_link *device_link_add(struct device *consumer,
 
 	link->link_dev.class = &devlink_class;
 	device_set_pm_not_required(&link->link_dev);
-	dev_set_name(&link->link_dev, "%s:%s",
+	dev_set_name(&link->link_dev, "%s--%s",
 		     dev_name(supplier), dev_name(consumer));
 	if (device_register(&link->link_dev)) {
 		put_device(consumer);