Bluetooth: Convert controller hdev->type to hdev->bus

The hdev->type is misnamed and should be actually hdev->bus instead. So
convert it now.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
index 75952741..bb0aefd 100644
--- a/drivers/bluetooth/hci_vhci.c
+++ b/drivers/bluetooth/hci_vhci.c
@@ -236,7 +236,7 @@
 
 	data->hdev = hdev;
 
-	hdev->type = HCI_VIRTUAL;
+	hdev->bus = HCI_VIRTUAL;
 	hdev->driver_data = data;
 
 	hdev->open     = vhci_open_dev;