Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Use pharos repo in daisy master branch"
  - Use pharos repo in daisy master branch

    There are no PDFs in euphrates branch of pharos repo.
    Securedlab is still used in euphrates branch. In master branch,
    pharos repo will be used.

    Change-Id: Ifbdeed26f938025aae56d2d263abf3d8620b31ba
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 63d7602..4071808 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 63d76020691ce1d5038ad42b2b059a51634dd650
+Subproject commit 407180828a48320043d37109b9f942087b2df267