Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Create stable/gambia branch for Auto project"
  - Create stable/gambia branch for Auto project

    Change-Id: Ic5e0a004422264fb91f27b1d1152518ef7b159b3
    Signed-off-by: Martin Klozik <martin.klozik@tieto.com>
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 63b4bbb..6856a6d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 63b4bbb595174ca3401bb98448552557425b2558
+Subproject commit 6856a6d362b69d3674092ec36b1061e8f19abea6