Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - AArch64: Move to pike-armband repo

    Armband restructured its repos to support UCA-only virtual deploys,
    propagate the change to our base image pre-build. Drop apt-mk repos,
    should only be added later by Salt, when MCP repos are also present.

    JIRA: ARMBAND-338

    Change-Id: Ieafa6d3fb0599679341053187b4a7d778af86428
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 2b0a158..ae4434b 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 2b0a1581730e5a96c6e8949237bb54d4d0ea2571
+Subproject commit ae4434bdf6a96e06286409aa51e8cd9975f7e8b8