RISC-V: Add zilsd & zclsd support

Ref: https://github.com/riscv/riscv-zilsd/blob/main/zilsd.adoc

Signed-off-by: dysun <sundongya@nucleisys.com>

Co-developed-by: LIU Xu <liuxu@nucleisys.com>
Co-developed-by: ZHAO Fujin <zhaofujin@nucleisys.com>