qcacmn: Add lock for MLME command queuing to Serialization

MLME commands need to be queued back to back in few scnearios,
added lock to avoid interleaving between commands queueing.

Change-Id: If34aee5849938cbd76183af971ea058ce63505ee
CRs-Fixed: 2384147

umac/mlme/vdev_mgr/dispatcher/inc/wlan_vdev_mlme_api.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -134,5 +134,23 @@ QDF_STATUS wlan_vdev_chan_config_valid(struct wlan_objmgr_vdev *vdev);
  *         FAILURE: otherwise failure
  */
 QDF_STATUS wlan_vdev_is_going_down(struct wlan_objmgr_vdev *vdev);
+
+/**
+ * wlan_vdev_mlme_cmd_lock - Acquire lock for command queuing atomicity
+ *
+ * API to take VDEV MLME command lock
+ *
+ * Return: void
+ */
+void wlan_vdev_mlme_cmd_lock(struct wlan_objmgr_vdev *vdev);
+
+/**
+ * wlan_vdev_mlme_cmd_unlock - Release lock for command queuing atomicity
+ *
+ * API to release VDEV MLME command lock
+ *
+ * Return: void
+ */
+void wlan_vdev_mlme_cmd_unlock(struct wlan_objmgr_vdev *vdev);
 #endif
 #endif