Fix watchdog to stop ping after wifi disconnects

- The pings are delayed async messages that were getting handled
after a disconnect as well

- Increase poll time to 200 ms, so we block on a receive for 1ms every 200ms for a
sent packet

Bug: 5361564
Change-Id: I1931a1c4146e78a87407d541d8c3934ff8232604
2 files changed