Update git submodules

* Update docs/submodules/armband from branch 'stable/fraser'
  - [p/openstack.nova] force creation of pty on aarch64

    Allow nova to create a pty device for aarch64VM

    JIRA: ARMBAND-352

    Change-Id: I7d481957342a0dfb5be38a01b3d755862321cfa7
    Signed-off-by: Charalampos Kominos <charalampos.kominos@enea.com>
    (cherry picked from commit 093f2b7684c86979dfa6f5f36f28689ca9b3e552)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 8e052cc..28c6bb0 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 8e052ccc117aa4fa8e38911aa2f303bd63f40ba3
+Subproject commit 28c6bb0cc4cec39c4d4916bc885f3dc381220836