[Bluetooth] Attach low-level connections to the Bluetooth bus

To receive uvents for the low-level ACL and SCO links, they must be
assigned to a subsystem. It is enough to attach them to the already
established Bluetooth bus.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 954eb74..3eeeb7a 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -259,7 +259,9 @@
 
 	BT_DBG("conn %p", conn);
 
-	conn->dev.parent  = &hdev->dev;
+	conn->dev.bus = &bt_bus;
+	conn->dev.parent = &hdev->dev;
+
 	conn->dev.release = bt_release;
 
 	snprintf(conn->dev.bus_id, BUS_ID_SIZE,