chassishandler: add AC failed bit support for chassis status

PFail property is provided by power control service,
true means the booting is from AC power loss.

Tested:
Remove the AC cable and reconnect it to power on the system
ipmitool chassis status will return:
Last Power Event     : ac-failed

Change-Id: I3743f15da259491052ee8fc869205438e79046f8
Signed-off-by: Yong Li <yong.b.li@linux.intel.com>
1 file changed