Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Update Dockerfile.aarch64.patch

    The patch doesn't apply anymore for the latest docker builds.
    Updated the patch to accomodate the latest changes to the Dockerfile

    Change-Id: Ia8a35337a421b3628c90be3060f049c655446758
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index bd44ab9..fe0edc2 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit bd44ab9134606c3a73045128d8a4c4d688f465f5
+Subproject commit fe0edc2eaf5ff60089f55d1860fdc20b343170c9