Currently PowerCycles field of Log Page is 0 and it is an invalid value.
also PowerOnHours keep 0 all the time.
this patch will initial the PowerCycles data to 1
and implement PowerOnHours caculation.
these values will be exposed when the guest reads the SMART/Health Log Page.
Signed-off-by: Wanpeng Qian <firstname.lastname@example.org>