On non x86 platforms the hardware reduce flag must be set in the FADT table. Write an error message if the flag is missing. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Simon Glass <sjg@chromium.org> Rebased on -next to use nomap, add hyphens: Signed-off-by: Simon Glass <sjg@chromium.org>