meta-romulus: Make avsbus-workaround run after power on

Romulus power on workarounds requires power is on, otherwise the i2c
devices are not accessible.
Changing avsbus-workaround to run after power on achieves the goal, that
all the power on sequence followed by avsbus-workaround are run after
power is on.

Note: During the period between power is on and CPLD trigger, PGOOD is
not asserted, which seems to break the op-power-start and
op-wait-power-on.

Change-Id: I0379b0adee53606f18fe64ce39c0acfe11c51622
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/meta-romulus/recipes-phosphor/chassis/avsbus-control/avsbus-enable@.service b/meta-romulus/recipes-phosphor/chassis/avsbus-control/avsbus-enable@.service
index c31d389..850da21 100644
--- a/meta-romulus/recipes-phosphor/chassis/avsbus-control/avsbus-enable@.service
+++ b/meta-romulus/recipes-phosphor/chassis/avsbus-control/avsbus-enable@.service
@@ -2,8 +2,6 @@
 Description=Enable the AVS bus on VRMs
 Wants=vrm-control@%i.service
 After=vrm-control@%i.service
-Wants=obmc-power-start-pre@%i.target
-Before=obmc-power-start-pre@%i.target
 Conflicts=obmc-power-chassis-off@%i.target
 
 [Service]
diff --git a/meta-romulus/recipes-phosphor/chassis/avsbus-control/avsbus-workaround@.service b/meta-romulus/recipes-phosphor/chassis/avsbus-control/avsbus-workaround@.service
index c98e758..ea18e16 100644
--- a/meta-romulus/recipes-phosphor/chassis/avsbus-control/avsbus-workaround@.service
+++ b/meta-romulus/recipes-phosphor/chassis/avsbus-control/avsbus-workaround@.service
@@ -1,7 +1,7 @@
 [Unit]
 Description=Perform AVS bus workaround on VRMs
-Wants=obmc-power-start-pre@%i.target
-Before=obmc-power-start-pre@%i.target
+Wants=op-power-start@.service
+After=op-power-start@.service
 Before=avsbus-disable@%i.service
 Conflicts=obmc-power-chassis-off@%i.target