In V2, change logic to avoid use mtf[-1] style to get value. Roll back to previous logic, and use point + offset to get byte value. Cc: Bell Song <binx.song@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Bell Song <binx.song@intel.com>