NASM doesn't support EXTERNDEF, so convert this to PUBLIC.
This will make it easier to convert this code to NASM using an
automated script.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
5262695ceb