phosphor-settingsd: add systemd depends

settingsd now does queries for specific objects, so we need those
objects to be populated.  Add 'Before' and 'Wants' directives for
the /org/openbmc/control/Host0 object.

Additional fixes for openbmc/openbmc#806.

Change-Id: Icd3c40180a84cea58da9a43f0449c066c632c8f0
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/common/recipes-phosphor/system/obmc-mgr-state/obmc-mgr-state.service b/common/recipes-phosphor/system/obmc-mgr-state/obmc-mgr-state.service
index 2a07c2b..681abb4 100644
--- a/common/recipes-phosphor/system/obmc-mgr-state/obmc-mgr-state.service
+++ b/common/recipes-phosphor/system/obmc-mgr-state/obmc-mgr-state.service
@@ -2,6 +2,8 @@
 Description=Restore Last State
 Wants=obmc-mgr-state.target
 After=obmc-mgr-state.target
+Wants=mapper-wait@-org-openbmc-settings-host0.service
+After=mapper-wait@-org-openbmc-settings-host0.service
 
 [Service]
 Restart=no