arch-riscv: Added the Zbc bitmanip instructions

Added clmul, clmulh, clmulr instructions.

Changes based on spec:
https://github.com/riscv/riscv-bitmanip/releases/download/1.0.0/bitmanip-1.0.0.pdf

Change-Id: I98dc76ddde052f56e32eabed12af87039def665b
Signed-off-by: Jerin Joy <joy@rivosinc.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58631
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Luming Wang <wlm199558@126.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed