qcacld-3.0: Fix tsf cap failure when SAP starts on DFS channel

When DFS channel is used WMI_VDEV_TSF_TSTAMP_ACTION_CMDID is
sent to fw before vdev is in up state. It leads the tsf capture
to enter into HDD_TS_STATUS_WAITING state as the fw returns
invalid tsf in the TSF report event.

The tsf capture has to be restarted to recover from this state.

Fix this by Calling hdd_stop_tsf_sync() while entering into CAC, 
the subsequent call to hdd_start_tsf_sync() will restart the tsf
capture.

CRs-Fixed: 2750676
Change-Id: Ie2fdf719d4b57035bf6fcc11824a894a1e313e23

core/hdd/src/wlan_hdd_hostapd.c

@@ -2085,6 +2085,7 @@ QDF_STATUS hdd_hostapd_sap_event_cb(struct sap_event *sap_event,
 		}
 
 		qdf_atomic_set(&adapter->ch_switch_in_progress, 0);
+		hdd_stop_tsf_sync(adapter);
 		break;
 	case eSAP_DFS_CAC_INTERRUPTED:
 		/*
@@ -5959,7 +5960,6 @@ static int __wlan_hdd_cfg80211_stop_ap(struct wiphy *wiphy,
 			}
 		}
 		clear_bit(SOFTAP_BSS_STARTED, &adapter->event_flags);
-		hdd_stop_tsf_sync(adapter);
 
 		/*BSS stopped, clear the active sessions for this device mode*/
 		policy_mgr_decr_session_set_pcl(hdd_ctx->psoc,
@@ -6651,8 +6651,6 @@ static int __wlan_hdd_cfg80211_start_ap(struct wiphy *wiphy,
 			goto err_start_bss;
 		}
 
-		hdd_start_tsf_sync(adapter);
-
 		if (wdev->chandef.chan->center_freq !=
 				params->chandef.chan->center_freq)
 			params->chandef = wdev->chandef;