add athena last ping time to deviceState (#20961)

old-commit-hash: 4e17c0b01a

cereal

@@ -1 +1 @@
-Subproject commit c429707aefcc960657577abc1895f88ea8adaf06
+Subproject commit c73da3724d3236b59b01edf7c1e3daabcf1ce17d

selfdrive/thermald/thermald.py

@@ -402,6 +402,10 @@ def thermald_thread():
     msg.deviceState.started = started_ts is not None
     msg.deviceState.startedMonoTime = int(1e9*(started_ts or 0))
 
+    last_ping = params.get("LastAthenaPingTime")
+    if last_ping is not None:
+      msg.deviceState.lastAthenaPingTime = int(last_ping)
+
     msg.deviceState.thermalStatus = thermal_status
     pm.send("deviceState", msg)