qcacmn: Enable STA DFS in F/W

If STA DFS is enabled before vdev creation through etc/config/wireless
then VDEV START is sent to F/W as a part of the normal flow to bring
the VAP up. However, if STA DFS is enabled/disabled on the fly for a
running VAP then do a VDEV STOP, followed by a VDEV START of the STA
VAP and set/unset WMI_CHAN_FLAG_STA_DFS flag in VDEV start.

Change-Id: I032ffa53d89eaafcb43c648670af3b3f2134561f
CRs-Fixed: 2843248

umac/dfs/dispatcher/src/wlan_dfs_tgt_api.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2020 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2021 The Linux Foundation. All rights reserved.
  *
  *
  * Permission to use, copy, modify, and/or distribute this software for
@@ -51,6 +51,8 @@ wlan_psoc_get_dfs_txops(struct wlan_objmgr_psoc *psoc)
 	return &tx_ops->dfs_tx_ops;
 }
 
+qdf_export_symbol(wlan_psoc_get_dfs_txops);
+
 bool tgt_dfs_is_pdev_5ghz(struct wlan_objmgr_pdev *pdev)
 {
 	struct wlan_lmac_if_dfs_tx_ops *dfs_tx_ops;