greybus: loopback: remove module specific identifier from debugfs name

The datapoint we are using to return metrics across modules and cports
shouldn't have a module identifier in it i.e.

/sys/kernel/debug/gb_loopback/raw_latency_endo0
not
/sys/kernel/debug/gb_loopback/raw_latency_endo0:X

This patch removes the module_id used up to this point. Including module_id
actually ends up making life harder in user-space so dropping it.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Patrick Titiano <ptitiano@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/loopback.c

@@ -883,11 +883,10 @@ static int gb_loopback_connection_init(struct gb_connection *connection)
 		return -ENOMEM;
 	gb_loopback_reset_stats(&gb_dev);
 
-	/* If this is the first connection - create a module endo0:x entries */
+	/* If this is the first connection - create a module endo0 entry */
 	mutex_lock(&gb_dev.mutex);
 	if (!gb_dev.count) {
-		snprintf(name, sizeof(name), "raw_latency_endo0:%d",
-			 connection->bundle->intf->module->module_id);
+		snprintf(name, sizeof(name), "raw_latency_endo0");
 		gb_dev.file = debugfs_create_file(name, S_IFREG | S_IRUGO,
 						  gb_dev.root, &gb_dev,
 				  &gb_loopback_debugfs_dev_latency_ops);