Watchdog: Enable Host Watchdog during early poweron

Enabling the Host Watchdog during early power on was
inadvertently removed and this change is bringing that back on.

Fixes openbmc/openbmc#1888

Change-Id: Ib2220e762379360742dee4a11c06f01a6060fbbe
Signed-off-by: Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com>
diff --git a/common/recipes-phosphor/watchdog/phosphor-watchdog/poweron.conf b/common/recipes-phosphor/watchdog/phosphor-watchdog/poweron.conf
index 7399fa5..93e74e3 100644
--- a/common/recipes-phosphor/watchdog/phosphor-watchdog/poweron.conf
+++ b/common/recipes-phosphor/watchdog/phosphor-watchdog/poweron.conf
@@ -1,2 +1,3 @@
 [Unit]
 Conflicts=obmc-host-stop@0.target
+Conflicts=obmc-chassis-poweroff@0.target