SecurityPkg: Clear AuthSession content after use.

SecurityPkg: Clear AuthSession content after use.

Some commands in Tpm2CommandLib accept AuthSession
as input parameter and copy to local command buffer.
After use, this AuthSession content should be zeroed,
because there might be some secrete there.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Zhang, Chao B" <chao.b.zhang@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19635 6f19259b-4bc3-4df7-8a09-765794883524