Monitor: disable inventory svc dependency in systemd

Now that Monitor can startup properly without depending on inventory,
this commit removes the systemd dependency, allowing the system to
startup more quickly.

Signed-off-by: Mike Capps <mikepcapps@gmail.com>
Change-Id: If36aee2265c9909a18ce27c8fbf56d04095dcc14
diff --git a/monitor/service_files/json/phosphor-fan-monitor@.service.in b/monitor/service_files/json/phosphor-fan-monitor@.service.in
index 0975784..3dd66aa 100644
--- a/monitor/service_files/json/phosphor-fan-monitor@.service.in
+++ b/monitor/service_files/json/phosphor-fan-monitor@.service.in
@@ -1,6 +1,5 @@
 [Unit]
 Description=Phosphor Fan Monitor Daemon
-After=mapper-wait@-xyz-openbmc_project-inventory.service
 
 [Service]
 Restart=on-failure