Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Adapt getting the image architecture to mcp"
  - Adapt getting the image architecture to mcp

    The part which gets the image architecture still uses the old fuel command.
    Adapted the script to use the mcp command.

    JIRA: ARMBAND-285

    Change-Id: Iddce77c3a856ea11f9994861151db89a402e735e
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index c305d24..2dd6004 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit c305d24c1499a5aef51c05e94fc9737878548c75
+Subproject commit 2dd6004f6eace58e97c4aa87b8a80b5f099d9f73