MdeModulePkg: Use monotonic count to initialize the NetLib random seed.

MdeModulePkg: Use monotonic count to initialize the NetLib random seed.

NetRandomInitSeed() function use current time to initialize the random seed,
while in some platform the time service is not accuracy that make the random
seed collision. This patch add the monotonic count to the seed to avoid this.

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>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18185 6f19259b-4bc3-4df7-8a09-765794883524