Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Add UEFI image extra properties for CentOS image for aarch64

    Add extra properties for CentOS image when using aarch64
    architecture with UEFI boot mode

    Signed-off-by: Delia Popescu <delia.popescu@enea.com>
    Change-Id: Ie8aa7482627cbb3c31c6c72a31a0e37e86a409c4

diff --git a/docs/submodules/functest b/docs/submodules/functest
index fbeac82..f39a901 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit fbeac82565ea94534e7bf65c85329950f5232308
+Subproject commit f39a901913177ff7d764714357a07ef5b8c1c9fe