lrdp_v2 : Fix for broken watchdog_v2.py for kernel < 4.4

For kernel version less than 4.4, as the member variable timer_expired
is not available we need to get watchdog timer expire status

Change-Id: I28db293d7d0300d55f5ae0abac188205b80d0359
Signed-off-by: Sudhir Kumar Reddy Varakantham <skvara@codeaurora.org>