[ot] update OpenThread to support older RCP (#495)
[ot] update OpenThread to support older RCP (#495)


jwhui/borderrouter,openthread/ot-br-posix,openthread/borderrouter,bukepo/borderrouter,openthread/ot-br-posix,openthread/ot-br-posix,bukepo/borderrouter,openthread/ot-br-posix,jwhui/borderrouter,bukepo/borderrouter,jwhui/borderrouter,openthread/borderrouter,openthread/borderrouter,openthread/borderrouter,bukepo/borderrouter,bukepo/borderrouter,jwhui/borderrouter,openthread/ot-br-posix,jwhui/borderrouter,openthread/borderrouter,openthread/borderrouter,openthread/ot-br-posix