Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "bottlenecks gambia branch"
  - bottlenecks gambia branch

    Add Gambia branch to Bottlenecks project

    Change-Id: Ie698b459abcb066ac767dee72f957b9c96c7eabd
    Signed-off-by: Yang (Gabriel) Yu <Gabriel.yuyang@huawei.com>
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 74193ca..c7fff82 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 74193ca1f6632daeb095ec32e2b146dc73bfc1f8
+Subproject commit c7fff82bb1af7849846f81915bc561c0ec225abd