This commit adds the VarCheckPolicyLib that will be able to execute in the context of standalone MM. Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org> Co-authored-by: Kun Qin <kun.q@outlook.com> Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Hao A Wu <hao.a.wu@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Cc: Sami Mujawar <sami.mujawar@arm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Supreeth Venkatesh <supreeth.venkatesh@arm.com> Cc: Bret Barkelew <Bret.Barkelew@microsoft.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>