qcacld-3.0: Modify timestamp for Roam Scan done event

In api cm_roam_scan_info_event(), fw_timestamp value
is fetched from wmi_roam_trigger_reason->timestamp
which results in same value as in roam trigger event.

Modified the api cm_roam_scan_info_event() to fetch
fw_timestamp value from
wmi_roam_scan_info->scan_complete_timestamp to send
proper roam scan done event fw_timestamp to userspace
to log.

Change-Id: Idb1bcfad223b20a57b47d6e0040305000f6165ea
CRs-Fixed: 3624454

components/umac/mlme/connection_mgr/core/src/wlan_cm_roam_offload.c

@@ -6144,7 +6144,7 @@ void cm_roam_scan_info_event(struct wlan_objmgr_psoc *psoc,
 	}
 
 	populate_diag_cmn(&wlan_diag_event->diag_cmn, vdev_id,
-			  (uint64_t)scan->ap->timestamp, &ap->bssid);
+			  (uint64_t)scan->scan_complete_timestamp, &ap->bssid);
 
 	wlan_diag_event->version = DIAG_SCAN_DONE_VERSION;