SecurityPkg: AuthVariableLib: Fix inconsistent CertDB case

SecurityPkg: AuthVariableLib: Fix inconsistent CertDB case

  2 steps are used to create/delete a time based variable.
  For create
     step 1: Insert Signer Cert to CertDB.
     Step 2: Insert Payload to Variable.
  For delete
     step 1: Delete Variable.
     Step 2: Delete Cert from CertDB.
  System may breaks between step 1 & step 2, so CertDB may contains useless
Cert in the next reboot. AuthVariableLib choose to sync consistent state
between CertDB & Time Auth Variable on initialization. However, it doesn't
apply Time Auth attribute check. Now add it.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Zeng Star <star.zeng@intel.com>