Update git submodules

* Update docs/submodules/armband from branch 'master'
  - u/fuel: Bump & rebase for lab proxy support

    While at it, fix MaaS hwe_kernel for AArch64 by switching back to
    4.13.

    Change-Id: Idb123eab370ef453b60ddb1dff40c2d8d7fd42c4
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index cf0e2f1..d951b65 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit cf0e2f19037db5138b09c77b33f2b96b2ad458e8
+Subproject commit d951b65660af591913e6e6315e6fe5a9e40d6551