MdeModulePkg: VarCheckUefiLib: Remove DeployedMode/AuditMode var check logic

MdeModulePkg: VarCheckUefiLib: Remove DeployedMode/AuditMode var check logic

Remove DeployedMode & AuditMode Global variable check for Customized Secure Boot feature defined in UEFI2.5 Mantis 1263.
The feature has been moved to
  https://github.com/tianocore/edk2-staging/tree/Customized-Secure-Boot
Previous check-in hash is
  SHA-1: 0f4f6d202a47e3882c6a7fb7ab9e55dda78a8113

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by: El-Haj-Mahmoud Samer <samer.el-haj-mahmoud@hpe.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>