Update git submodules

* Update docs/submodules/armband from branch 'master'
  - p/reclass-system-salt-model: drop openstack arch

    mcp-repos now has arm64 packages too, drop its architecture list
    (currently hardcoded to 'amd64') to be able to pick them up.

    Change-Id: Icefefe21111dc65713fde45ed9994e78e6b33ca6
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index da4a72b..4dacfa4 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit da4a72b2ee47253ae763752254fbd049155d941e
+Subproject commit 4dacfa496fa0a714835abed1267ee76ec979993a