Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - Makefile: patches-export: Remove existing patches

    In case patch filenames changed, clear the old patches from the
    destination directory prior to exporting new patches.

    Change-Id: I65e56ae042dca1c769a0f68a449b3b0e7d7d25dc
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 3f5c1defe0ce6fa69042f57db6ca9116f7be048b)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index f664958..c8b6bc1 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit f664958240ca87b430c5f423e32bed557306bad1
+Subproject commit c8b6bc16ff2aeeccd8e4a07a9e1cb8a475fd4748