Merge "libbinder: RPC sockets - remove unnecessary SIGHUP"

status_t RpcSession::FdTrigger::triggerablePoll(base::borrowed_fd fd, int16_t event) {

    while (true) {

        pollfd pfd[]{{.fd = fd.get(),

                      .events = static_cast<int16_t>(event | POLLHUP),

                      .revents = 0},

        pollfd pfd[]{{.fd = fd.get(), .events = static_cast<int16_t>(event), .revents = 0},

                     {.fd = mRead.get(), .events = POLLHUP, .revents = 0}};

        int ret = TEMP_FAILURE_RETRY(poll(pfd, arraysize(pfd), -1));

        if (ret < 0) {