Bluetooth: Introduce hci_dev_set_flag helper macro

Instead of manually coding set_bit on hdev->dev_flags all the time,
use hci_dev_set_flag helper macro.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 42fa105..fd7b2a9 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -307,7 +307,7 @@
 	if (hci_dev_test_flag(hdev, HCI_LE_ADV) ||
 	    hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT)) {
 		BT_DBG("Deferring random address update");
-		set_bit(HCI_RPA_EXPIRED, &hdev->dev_flags);
+		hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);
 		return;
 	}