MdeModulePkg: Make the DEBUG info consistent in SNP driver.

MdeModulePkg: Make the DEBUG info consistent in SNP driver.

SNP driver will print the UNDI returned StatFlags:StatCode with DEBUG macro,
while in some please it uses the reverse order (StatCode:StatFlags). This patch
is to make the print info consistent, that StatFlags always come first.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>