Remove unused old_key_type from mgmt_ev_new_key
diff --git a/lib/mgmt.h b/lib/mgmt.h
index 3578ecd..6c84312 100644
--- a/lib/mgmt.h
+++ b/lib/mgmt.h
@@ -237,7 +237,6 @@
 #define MGMT_EV_NEW_KEY			0x000A
 struct mgmt_ev_new_key {
 	struct mgmt_key_info key;
-	uint8_t old_key_type;
 } __packed;
 
 #define MGMT_EV_DEVICE_CONNECTED	0x000B