Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Add AARCH64 images back to Functest"
  - Add AARCH64 images back to Functest

    aarch64 path files is reupdated with aarch64 cirros images
    Functest is now able to run on aarch64 too, using the appropriate images
    JIRA: ARMBAND-279

    Change-Id: I05de0cb8315a33322225a6caedaa64a5a4833e4e
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>
    Signed-off-by: Alexandru Nemes <alexandru.nemes@enea.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index f190b35..ff66139 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit f190b3532263cfede083b775c1f94cab1fa027fd
+Subproject commit ff66139d445b0401763043764d2e243c21dc5f56