Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Backport ramspeed benchmarking playbook from qtip.driver

    Change-Id: I99c6bcb43074cdf7f9edd93a0fe10b401fff4374
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 973f028..cf4a1fc 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 973f0287b44b3bcac193bc069bd474fc252232db
+Subproject commit cf4a1fc9562e0c7d205da5b4dc79824e53f1d304