Removes MacString Rt attribute in Ip4Config/Mnp driver.
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Dong, Guo <guo.dong@intel.com>
Reviewed-by: Yao, Jiewen <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg@15351 6f19259b-4bc3-4df7-8a09-765794883524