Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[baremetal] cleanup: Remove unused gtw node data"
  - [baremetal] cleanup: Remove unused gtw node data

    Change-Id: I48f73caa0f7cae532d4d9b3f68e1d8de59f8dd9e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index a4abff1..8673180 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit a4abff17c7b71408762353bb1ef52d9ffbec2fb7
+Subproject commit 8673180dad54592382f339dba35cd3d753c5d18e