MdeModulePkg/SecurityPkg Variable: Return error status to avoid inconsistency between PlatformLang and Lang.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15340 6f19259b-4bc3-4df7-8a09-765794883524
Use PXE_OPFLAGS_STATION_ADDRESS_WRITE when setting new MAC address for the NIC in SNP driver.
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Dong, Guo <guo.dong@intel.com>
Reviewed-by: Jin, Eric <eric.jin@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15350 6f19259b-4bc3-4df7-8a09-765794883524