Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to cd1924fa52bc2d1e4e8b881993cfdbca1b8be152
  - Add support for build-node var to ar-release job

    This job type had the build-node hardcoded to a specific machine
    so did not allow variable overriding. Let's fix that.

    Change-Id: I6f722082728db8c39c6abb84b18e45b48d77fed5
    Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>

diff --git a/docs/submodules/releng/builder b/docs/submodules/releng/builder
index d74d11086efae7deeeb7e8c37bf6dc287ee07e85..cd1924fa52bc2d1e4e8b881993cfdbca1b8be152 160000 (submodule)
--- a/docs/submodules/releng/builder
+++ b/docs/submodules/releng/builder
@@ -1 +1 @@
-Subproject commit d74d11086efae7deeeb7e8c37bf6dc287ee07e85
+Subproject commit cd1924fa52bc2d1e4e8b881993cfdbca1b8be152