Update git submodules

Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - Merge "p/fuel: armband state: ACPI depends on AAVMF" into stable/euphrates
  - p/fuel: armband state: ACPI depends on AAVMF

    On AArch64 systems, ACPI should only be added to the domain XML
    by nova via libvirt driver when guest UEFI (AAVMF) is used.

    Change-Id: I395e65a5790615c926eb86f754ff7b7f8feac26a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 73fc006a6ef0f83027bcad2eec0076bcc50b4679)