qcacld-3.0: Optimize processing of DFS phy events

qcacld-2.0 to qcacld-3.0 propagation

Optimize by avoiding processing of DFS phy events in below scenario's

1)Once radar indication given to UMAC.
2)Vdev restart in SAP interface

Change-Id: Ib175feed4a611a5c7185202e3d50abc3e84fc781
CRs-Fixed: 910586

core/sap/dfs/src/dfs_process_radarevent.c

@@ -224,6 +224,16 @@ int dfs_process_radarevent(struct ath_dfs *dfs, struct ieee80211_channel *chan)
 		ATH_DFSEVENTQ_UNLOCK(dfs);
 
 		found = 0;
+		cdf_spin_lock_bh(&dfs->ic->chan_lock);
+		if (dfs->ic->disable_phy_err_processing) {
+			ATH_DFSQ_LOCK(dfs);
+			empty = STAILQ_EMPTY(&(dfs->dfs_radarq));
+			ATH_DFSQ_UNLOCK(dfs);
+			cdf_spin_unlock_bh(&dfs->ic->chan_lock);
+			continue;
+		}
+
+		cdf_spin_unlock_bh(&dfs->ic->chan_lock);
 		if (re.re_chanindex < DFS_NUM_RADAR_STATES)
 			rs = &dfs->dfs_radar[re.re_chanindex];
 		else {