Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[AArch64] VCP VMs: Switch back to 4.4.x LTS kernel"
  - [AArch64] VCP VMs: Switch back to 4.4.x LTS kernel

    JIRA: ARMBAND-398

    Change-Id: I329346755348525f00602d7f89af295c141a20d5
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index eabdb8a..0568ff2 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit eabdb8a31e5836f80340758059eec81ca341906f
+Subproject commit 0568ff25749577fc7ef718b4e60d890365396fa6