qcacmn: Refine chirp check for ETSI type 4 radar

Currently if the delta peak of the ETSI type 4 radar pulse is 0, it will
be considered as radar false dection, which affects normal dfs ETSI type
4 certification test.

More checks are added when delta peak of the ETSI type 4 radar pulse is 0.
If psidx_diff, the difference in the FFT peak index between the short FFT
and the first long FFT, is greater than 4 and less than 16, it is still
considered as valid ETSI type 4 radar pulse.

Change-Id: Iee9c22e0c208023bb9f0f70121f8269169b63d18
CRs-Fixed: 2173576

wmi_unified_tlv.c

@@ -21203,6 +21203,14 @@ static QDF_STATUS extract_wlan_radar_event_info_tlv(
 	wlan_radar_event->peak_sidx = radar_event->peak_sidx;
 	wlan_radar_event->delta_peak = radar_event->pulse_delta_peak;
 	wlan_radar_event->delta_diff = radar_event->pulse_delta_diff;
+	if (radar_event->pulse_flags &
+			WMI_DFS_RADAR_PULSE_FLAG_MASK_PSIDX_DIFF_VALID) {
+		wlan_radar_event->is_psidx_diff_valid = true;
+		wlan_radar_event->psidx_diff = radar_event->psidx_diff;
+	} else {
+		wlan_radar_event->is_psidx_diff_valid = false;
+	}
+
 	wlan_radar_event->pdev_id = radar_event->pdev_id;
 
 	return QDF_STATUS_SUCCESS;