Use the new RestartCause interface

Tested:
Combined with the RestartCause changes ran 'ipmitool raw 0 7'
and 'ipmitool chassis restart_cause' commands and confirmed that
they correctly return the current RestartCause.

Change-Id: I8361040b12db6567ea48157b9f2e048054e8df1d
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
1 file changed