Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - u/fuel: Bump & rebase for VCP state split

    Change-Id: I6f0367d75ea831de78ced480ea73d1cd10680b80
    (cherry picked from commit 11143873e70e65d07d73617b8af29a07adffc1aa)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 956d1d0..6e71b19 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 956d1d0056c54fe4c886126dcf489b547b01d49a
+Subproject commit 6e71b19097781a7190bcec015afc62be7961fa43