KVM: riscv: selftests: Add Svvptc/Zabha/Ziccrse exts to get-reg-list test

The KVM RISC-V allows Svvptc/Zabha/Ziccrse extensions for Guest/VM
so add them to get-reg-list test.

Signed-off-by: Quan Zhou <zhouquan@iscas.ac.cn>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/35163f0443993a942e0a021c6006bc5d2f0f5d5f.1732854096.git.zhouquan@iscas.ac.cn


Signed-off-by: Anup Patel <anup@brainfault.org>