I bisected this down to the following edk2 commit:

commit 78c41ff519b187d8979cda7074f007a6323f9acd (refs/bisect/bad)
Author: Ard Biesheuvel <ard.biesheu...@linaro.org>
Date:   Thu Mar 9 16:59:34 2017 +0100

    ArmVirtPkg/FdtClientDxe: make DT table installation !ACPI dependent
    
    Instead of having a build time switch to prevent the FDT configuration
    table from being installed, make this behavior dependent on whether we
    are passing ACPI tables to the OS. This is done by looking for the
    ACPI 2.0 configuration table, and only installing the FDT one if the
    ACPI one cannot be found.

Which makes sense - arm64/ACPI support wasn't baked yet upstream in
v4.4.

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Title:
  qemu-efi-aarch64 in >= artful can't boot xenial cloud images

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