Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Rename project to 'yardstick' from 'yardstick-arm64'"
  - Rename project to 'yardstick' from 'yardstick-arm64'

    The project should be 'yardstick' when git fetch the upstream
    project.

    Change-Id: I5cf21027febdcc17d5775b2d8ef7b3128689c435
    Signed-off-by: trevortao <trevor.tao@arm.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d0d6937..47615f6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d0d69375892fbdd3280c7f23ec146f9e62c034f2
+Subproject commit 47615f65f9c90b4d7523b4104d04b057b90d40f7