No ARM support for ACPI is planned under any OS we intend to run under ArmVirtQemu-ARM, so remove the drivers from the ARM build. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com>