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/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c
index f97771c..53a43ad 100644
--- a/drivers/bluetooth/btmrvl_main.c
+++ b/drivers/bluetooth/btmrvl_main.c
@@ -563,7 +563,7 @@
 
 	priv->btmrvl_dev.tx_dnld_rdy = true;
 
-	hdev->type = HCI_SDIO;
+	hdev->bus = HCI_SDIO;
 	hdev->open = btmrvl_open;
 	hdev->close = btmrvl_close;
 	hdev->flush = btmrvl_flush;