Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - remove more old apexlake testcases

    fix fraser failures

    Change-Id: I8bb12a762054a4c3274cc6e0297e948b92700e7e
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 7262ad1..2fe0cfa 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 7262ad1b008f74b51460ce07986458ca3bfe8cc8
+Subproject commit 2fe0cfa88f1792acb11fd875f7dd2fc9940a3866