NetworkPkg: Fix connection issue after correct SPD and re-enable IPsec

NetworkPkg: Fix connection issue after correct SPD and re-enable IPsec

This patch is used to fix connection failure issue after correct the SPD
and re-enable IPsec. The driver should not update the SadEntry's SpdSelector
when doing SpdEntry modification. SadEntry's SpdSelector may not equal to
this edited SpdEntry’s Selector.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18484 6f19259b-4bc3-4df7-8a09-765794883524