Make op-power-start a oneshot service

oneshot will cause the target to fail, which is
what we want on service failures

Change-Id: I1c3fe7159af51e92a2d0f4a7361e5e828675515d
Signed-off-by: Andrew Geissler <andrewg@us.ibm.com>
diff --git a/meta-phosphor/common/recipes-phosphor/chassis/obmc-op-control-power/op-power-start@.service b/meta-phosphor/common/recipes-phosphor/chassis/obmc-op-control-power/op-power-start@.service
index e98d08f..d6c1ae4 100644
--- a/meta-phosphor/common/recipes-phosphor/chassis/obmc-op-control-power/op-power-start@.service
+++ b/meta-phosphor/common/recipes-phosphor/chassis/obmc-op-control-power/op-power-start@.service
@@ -10,6 +10,7 @@
 
 [Service]
 RemainAfterExit=yes
+Type=oneshot
 ExecStart={sbindir}/mapper call /org/openbmc/control/power%i org.openbmc.control.Power setPowerState i 1
 
 [Install]