Update "Get BMC Flash Chip Boot Side" logic
Update "Get BMC Flash Chip Boot Side" logic

Due to kernel 4.17 changes "/dev/mem" has been turned off and the
same can be fetch from "/sys/class/watchdog/watchdog1/bootstatus".

Resolves  openbmc/openbmc-test-automation#1410

Change-Id: Id574b99fcd56610b79c1dd457d713a97c7e9e07c
Signed-off-by: George Keishing <bef0a9ecac45fb57611777c8270153994e13fd2e@in.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation