Update git submodules

Update git submodules

* Update docs/submodules/armband from branch 'master'
  - p/fuel: salt-formulas: Enable Armband formula

    FIXME: Re-enable apparmor.
    FIXME: Detect baremetal and re-enable acceleration.

    Based on old Armband Fuel patches:
    - install qemu-efi;
    - install vgabios;
    - disable apparmor as security driver for libvirt (temporary);
    - fix missing link for vgabios binary blob;
    - nova: virt_type=qemu (temporary, until we support baremetal too);
    - nova: pointer_model=ps2mouse since AArch64 has no USB tablet;
    - nova: cpu_model=cortex-a57;
    - nova: libvirt driver: Add ttyAMA0 by default on AArch64;
    - nova: libvirt driver: Use VGA video type by default on AArch64;

    Change-Id: I6aa87ac8d1c2f9fe3919b80fd29ab84ccfaa7c38
    Signed-off-by: Guillermo Herrero <Guillermo.Herrero@enea.com>
    Signed-off-by: Charalampos Kominos <Charalampos.Kominos@enea.com>
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>