ensure service start success

- In phosphor-ipmi-host, if service start failed, it will auto
  restart. But kcs service will not start because dependency
  service start failed if ipmi-host service start failed at first
  time. So change dependency to use Wants instead of Requires.

Signed-off-by: Harvey.Wu <Harvey.Wu@quantatw.com>
Change-Id: I73aa563ab31a4c66802f67420291b87636e16a97
diff --git a/phosphor-ipmi-kcs@.service.in b/phosphor-ipmi-kcs@.service.in
index 3dacda4..eaa0967 100644
--- a/phosphor-ipmi-kcs@.service.in
+++ b/phosphor-ipmi-kcs@.service.in
@@ -1,6 +1,6 @@
 [Unit]
 Description=Phosphor IPMI KCS DBus Bridge
-Requires=phosphor-ipmi-host.service
+Wants=phosphor-ipmi-host.service
 After=phosphor-ipmi-host.service
 
 [Service]