This patch fixes the ARM build failure introduced by
2be45bfe2779043bc3566e879e7ec279412012dc.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>