Bluetooth: btintel: Add support for enabling tracing functionality

For Intel controllers with firmware that allows tracing of baseband
functionality this allows enabling it via set_diag driver callback.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
diff --git a/drivers/bluetooth/hci_intel.c b/drivers/bluetooth/hci_intel.c
index 2952107..c5e69e0 100644
--- a/drivers/bluetooth/hci_intel.c
+++ b/drivers/bluetooth/hci_intel.c
@@ -557,6 +557,7 @@
 
 	bt_dev_dbg(hdev, "start intel_setup");
 
+	hu->hdev->set_diag = btintel_set_diag;
 	hu->hdev->set_bdaddr = btintel_set_bdaddr;
 
 	calltime = ktime_get();