Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "testcase: add rate parameter for spec cpu 2006"
  - testcase: add rate parameter for spec cpu 2006

    Change-Id: I5f1634d2a30eb93b4632e4773cee3f8b7a151b1f
    Signed-off-by: JingLu5 <lvjing5@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 6ed428f..3d462aa 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 6ed428f18c3554a71831cd1ba3d3827aecb7ef03
+Subproject commit 3d462aaa3d87a2298cf1f9a859e996d708f917fd