mei: bus: add and call callback on notify event

Enable drivers on mei client bus to subscribe
to asynchronous event notifications.
Introduce events_mask to the existing callback infrastructure
so it is possible to handle both RX and event notification.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nfc/mei_phy.c

@@ -355,7 +355,8 @@ static int nfc_mei_phy_enable(void *phy_id)
 		goto err;
 	}
 
-	r = mei_cl_register_event_cb(phy->device, nfc_mei_event_cb, phy);
+	r = mei_cl_register_event_cb(phy->device, BIT(MEI_CL_EVENT_RX),
+				     nfc_mei_event_cb, phy);
 	if (r) {
 		pr_err("Event cb registration failed %d\n", r);
 		goto err;