Update the structure of EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL, PXE_HW_UNDI, PXE_SW_UNDI to support greater than 256NICs in UNDI (Request by UEFI2.4 Mantis991).

Signed-off-by: Qian Ouyang <qian.ouyang@intel.com>
Reviewed-by: Ting Ye <ting.ye@intel.com>
             Siyuan Fu <siyuan.fu@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/OptionRomPkg@14569 6f19259b-4bc3-4df7-8a09-765794883524