add xos_images to mock profiles

Change-Id: Ib64ee86e06c4a09713918d9f686a10f40fe4935e
diff --git a/profile_manifests/mock-mcord.yml b/profile_manifests/mock-mcord.yml
index 596a587..42b21d5 100644
--- a/profile_manifests/mock-mcord.yml
+++ b/profile_manifests/mock-mcord.yml
@@ -72,3 +72,5 @@
     subj: "/C=US/ST=California/L=Menlo Park/O=ON.Lab/OU=Test Deployment/CN=xos-core.{{ site_suffix }}"
     altnames:
       - "DNS:xos-core.{{ site_suffix }}"
+
+xos_images: []
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