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_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index aa09193..76a1abb 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -383,7 +383,7 @@
 
 	hu->hdev = hdev;
 
-	hdev->type = HCI_UART;
+	hdev->bus = HCI_UART;
 	hdev->driver_data = hu;
 
 	hdev->open  = hci_uart_open;