Collapse Mirantis apt pining opts

  * Include 'system.linux.system.repo.mcp.apt_mirantis.mirantis_pining'
    to all nodes

Prod-related: PROD-25786 (PROD:25786)

Change-Id: I3e8fb9aed212efc70de3aadbd7c0bd39bdac0ef3
(cherry picked from commit 20b8a4c550ad16aaa1eecefd635ea43624b434d6)
diff --git a/linux/system/single/mcp.yml b/linux/system/single/mcp.yml
index 850a7ac..a77459d 100644
--- a/linux/system/single/mcp.yml
+++ b/linux/system/single/mcp.yml
@@ -1,5 +1,6 @@
 classes:
 - system.linux.system.single.simple
+- system.linux.system.repo.mcp.apt_mirantis.mirantis_pining
 parameters:
   linux:
     system: