Change apt_mk_version => mcp_version

   * Alligh all variables to one
   * Due mcp_version: ${_param:apt_mk_version}
     those change still bw compatible

Bug-relateted: PROD-24789 (PROD:24789)
Change-Id: I30b6fb0b1cb66c7d56dbb3a5e15c8bc9606405b5
diff --git a/linux/system/repo/mcp/extra.yml b/linux/system/repo/mcp/extra.yml
index abd6948..b4004da 100644
--- a/linux/system/repo/mcp/extra.yml
+++ b/linux/system/repo/mcp/extra.yml
@@ -2,7 +2,7 @@
 - system.linux.system.repo.keystorage.mirantis_com
 parameters:
   _param:
-    linux_system_repo_mcp_extra_version: ${_param:apt_mk_version}
+    linux_system_repo_mcp_extra_version: ${_param:mcp_version}
   linux:
     system:
       repo: