Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "impl update trust_indicator in scenario"
  - impl update trust_indicator in scenario

    Change-Id: I1afe38412926778bc84d178dbbfc3fe0cde15f69
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index fb0271b..b6d1249 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit fb0271be568c4737f6ce6fa9d222ccee26c096ee
+Subproject commit b6d124999387d3a1b86ba046a89f6e96863a9b55