KVM: riscv: selftests: Add some Zc* extensions to get-reg-list test

The KVM RISC-V allows Zca, Zcf, Zcd and Zcb extensions for Guest/VM so
add these extensions to get-reg-list test.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Acked-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20240619113529.676940-12-cleger@rivosinc.com


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>