power: use orderly shutdown

power: use orderly shutdown

User an orderly shutdown for factory kill instead of a
kernel power off.  The orderly shutdown will attempt to
call the reboot binary from userspace first, and then
fallback to kernel power off if it fails.

Change-Id: Ia05f1c9e1ca25b403a4c5507da2d61d267e67def
Signed-off-by: zhaoxp3 <zhaoxp3@motorola.com>
Reviewed-on: https://gerrit.mot.com/1339132
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Wei Xu <xuwei9@mt.com>
Submit-Approved: Jira Key