Remove ASSERT when failed to Get/Set “AttemptOrder” and “ClientId” variable.

Remove ASSERT when failed to Get/Set “AttemptOrder” and “ClientId” variable.
Removes RT attribute for “AttemptOrder” variable.
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Dong, Guo <guo.dong@intel.com>
Reviewed-by: Yao, Jiewen <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15328 6f19259b-4bc3-4df7-8a09-765794883524