Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "[docs] Rename image tc014_pod_frase{e,}r.png"
  - [docs] Rename image tc014_pod_frase{e,}r.png

    docs/release/results/tc014-cpu-processing-speed.rst
    includes the image tc014_pod_fraser.png. This image was
    incorrectly named tc014_pod_fraseer.png.

    This patch fixes the image name so that the link is valid.

    JIRA: YARDSTICK-1416
    Change-Id: I37d8ee687f4dbd1a8b906e2934a4119f9fdd8041
    Signed-off-by: Emma Foley <emma.l.foley@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 189b829..9d4930b 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 189b8296f83d9bb1fbbc5cf06d1f080f42b22cdf
+Subproject commit 9d4930bdfb80437a3149b080f195416814a44b75