reg-config: ensure runs before chassis power on

openbmc/phosphor-state-manager#16 documents an issue with the
obmc-power-start-pre@.target. Root cause is unknown at this point. Until
root cause is understood there, set the service dependency directly to
ensure this service always runs prior to chassis power being turned on.

Tested:
- Ran 10 power on/off and verified this service always ran before power
  was turned on to the chassis.

Change-Id: I6192d8226f6916ba36b01407f271215bd53c2ab3
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/services/phosphor-regulators-config.service b/services/phosphor-regulators-config.service
index 7f59533..2193184 100644
--- a/services/phosphor-regulators-config.service
+++ b/services/phosphor-regulators-config.service
@@ -2,6 +2,7 @@
 Description=Phosphor Power Regulators Config
 Wants=obmc-power-start-pre@0.target
 Before=obmc-power-start-pre@0.target
+Before=op-power-start@0.service
 Conflicts=obmc-chassis-poweroff@0.target
 # No need to run again if BMC reboots at runtime
 ConditionPathExists=!/run/openbmc/chassis@0-on