Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - u/fuel: Bump & rebase for MaaS prx et al
    
    Change-Id: Ib2fa3af6c1336ad31868a812abe2b8257f69895c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    
  - MaaS: preseed Armband repo via curtin
    
    Instead of installing upstream vanilla kernel from Ubuntu just to
    upgrade to the one from Armband repo later, preseed Armband repo
    config via curtin.
    This allows us to drop a kernel update cycle, thus saving a few
    minutes at each deploy.
    
    While at it, switch salt repo addition to use the maas region reclass
    section instead of adding a dedicated mechanism for it in the curtin
    template (only for arm64).
    
    [ stable/ euphrates ]
    Preseed all Armband repos, since Ocata does not have a "common" repo.
    
    JIRA: ARMBAND-280
    
    Change-Id: Iad5953a7de80d728f11a4ce3113bd7725100c31c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 648ec98613d31e3d9701b9ac1d87aed640b245f3)
    

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