Update git submodules

* Update docs/submodules/armband from branch 'stable/danube'
  - cleanup: Fuel: docker: remove obsolete ffi patch

    This patch is no longer needed, since upstream package repos have
    fixed meanwhile.

    Change-Id: Ic73d7e60cce6a1a0c152885caeb30f49d68e7441
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 0716a89e4055be29c140044608293ec5a95b08c6)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 5322ced..bf84b5e 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 5322ced367a79d9e605407cdf51d7c125440b85e
+Subproject commit bf84b5e16c0c54c76b86393ce674ec6b604ddeb1