SecurityPkg: Security package changes for RISC-V EDK2 CI.

SecurityPkg: Security package changes for RISC-V EDK2 CI.

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>