power-on: remove redundant before instruction

This service already has a Before=obmc-power-start@.target which itself
runs before obmc-power-on@.target.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: Ie65c1ed2834b322c797e1a687366b80029cbf7a8
diff --git a/recipes-phosphor/chassis/obmc-op-control-power/op-wait-power-on@.service b/recipes-phosphor/chassis/obmc-op-control-power/op-wait-power-on@.service
index 1e65d08..bc64595 100644
--- a/recipes-phosphor/chassis/obmc-op-control-power/op-wait-power-on@.service
+++ b/recipes-phosphor/chassis/obmc-op-control-power/op-wait-power-on@.service
@@ -1,6 +1,5 @@
 [Unit]
 Description=Wait for Power%i to turn on
-Before=obmc-power-on@%i.target
 Wants=obmc-power-start@%i.target
 Before=obmc-power-start@%i.target
 Wants=mapper-wait@-org-openbmc-control-power%i.service