param for specific repo release version (apt_mk)

Change-Id: Ief3c9e0e5ff0b5b068aba9ef45ef95c9d4152a02
diff --git a/linux/system/repo_local/mcp/salt.yml b/linux/system/repo_local/mcp/salt.yml
index 3abbf92..dafa8e7 100644
--- a/linux/system/repo_local/mcp/salt.yml
+++ b/linux/system/repo_local/mcp/salt.yml
@@ -1,11 +1,12 @@
 parameters:
   _param:
     apt_mk_version: stable
+    linux_system_repo_mcp_salt_version: ${_param:apt_mk_version}
   linux:
     system:
       repo:
         mcp_salt:
           refresh_db: ${_param:linux_repo_refresh_db}
-          source: "deb [arch=amd64] http://${_param:local_repo_url}/ubuntu-${_param:linux_system_codename}/ ${_param:apt_mk_version} salt"
+          source: "deb [arch=amd64] http://${_param:local_repo_url}/ubuntu-${_param:linux_system_codename}/ ${_param:linux_system_repo_mcp_salt_version} salt"
           architectures: amd64
-          key_url: "http://${_param:local_repo_url}/public.gpg"
\ No newline at end of file
+          key_url: "http://${_param:local_repo_url}/public.gpg"