Add SALT_MODELS_SYSTEM_REF_CHANGE parameter for E\\ deployments

PROD-36517

Change-Id: I5fb0cfc828cccc67dccf841d307827d9e649cab2
diff --git a/jobs/templates/bm-e7-cicd-pike-odl-maas.yml b/jobs/templates/bm-e7-cicd-pike-odl-maas.yml
index 1b21f1c..80a464e 100644
--- a/jobs/templates/bm-e7-cicd-pike-odl-maas.yml
+++ b/jobs/templates/bm-e7-cicd-pike-odl-maas.yml
@@ -43,6 +43,11 @@
         name: MCP_VERSION
         trim: 'false'
     - string:
+        default: ''
+        description: ''
+        name: SALT_MODELS_SYSTEM_REF_CHANGE
+        trim: 'false'
+    - string:
         default: sre-team-infra
         description: ''
         name: NODE_NAME