Added pinning for local repos

Change-Id: I884ec48a5f9851242a744e5bac7568a1f89f491d
diff --git a/linux/system/repo_local/mcp/extra.yml b/linux/system/repo_local/mcp/extra.yml
index b7ae91a..c55ecfc 100644
--- a/linux/system/repo_local/mcp/extra.yml
+++ b/linux/system/repo_local/mcp/extra.yml
@@ -10,3 +10,8 @@
           source: "deb [arch=amd64] http://${_param:local_repo_url}/ubuntu-${_param:linux_system_codename}/ ${_param:linux_system_repo_mcp_extra_version} extra"
           architectures: amd64
           key_url: "http://${_param:local_repo_url}/public.gpg"
+          clean_file: true
+          pin:
+          - pin: 'release a=${_param:linux_system_repo_mcp_extra_version}'
+            priority: 1100
+            package: '*'