Update git submodules

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

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 265d4c7..b488e5e 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 265d4c7123c64f45bc04878f8dba64a98948987a
+Subproject commit b488e5e08984b2454979a75163e93a64e4855e98