riscv: Enable seccomp architecture tracking

stable inclusion
from stable-5.11-rc1
commit 673a11a7
bugzilla: 167382
CVE: N/A

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=673a11a7e4152b101bad6851c4e4c34c7c6d6dde



-------------------------------------------------

To enable seccomp constant action bitmaps, we need to have a static
mapping to the audit architecture and system call table size. Add these
for riscv.

Signed-off-by: YiFei Zhu <yifeifz2@illinois.edu>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/58ef925d00505cbb77478fa6bd2b48ab2d902460.1605101222.git.yifeifz2@illinois.edu


Signed-off-by: GONG, Ruiqi <gongruiqi1@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>