Depend on /cfg mount in units which access it

Change-Id: I218b52d2adc8979bca9bde52e22d799165e5a6d1
diff --git a/package/czechlight-cfg-fs/sysrepo-persistent-cfg.service b/package/czechlight-cfg-fs/sysrepo-persistent-cfg.service
index fcb1d7e..ae06e96 100644
--- a/package/czechlight-cfg-fs/sysrepo-persistent-cfg.service
+++ b/package/czechlight-cfg-fs/sysrepo-persistent-cfg.service
@@ -1,6 +1,6 @@
 [Unit]
 Description=Persisting persistent sysrepo datastores to /cfg
-After=sysrepod.service
+After=sysrepod.service cfg.mount
 Requires=cfg.mount
 
 [Service]