MdeModulePkg: Remove network related guid definitions from MdeModulePkg.dec

MdeModulePkg: Remove network related guid definitions from MdeModulePkg.dec

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2196
Network related guid definitions have been moved into NetworkPkg.dec.
So, they can be removed from MdeModulePkg.dec.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Siyuan Fu <siyuan.fu@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>