Add RISC-V architecture to SecurityPkg for EDK2 CI testing. BZ:2562: https://bugzilla.tianocore.org/show_bug.cgi?id=2562 Signed-off-by: Abner Chang <abner.chang@hpe.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Chao Zhang <chao.b.zhang@intel.com> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Gilbert Chen <gilbert.chen@hpe.com> Cc: Daniel Schaefer <daniel.schaefer@hpe.com>