Fix interface usage for OperatingSystemState

OperatingSystemState property of
xyz.openbmc_project.State.OperatingSystem.Status should be PDI enum of
type OSStatus.  This commit fixes the OperatingSystemState values to
be compatible with PDI.

Tested:
Confirmed that the OperatingSystemState check returns true when the
system resets and OperatingSystemState changes to the full enum
string of "xyz...Inactive".

Signed-off-by: Jason M. Bills <jason.m.bills@intel.com>
Change-Id: I8bac5456905aaecd77e44f96fccb72699a1c128b
1 file changed