RISC-V: KVM: Change zicbom/zicboz block size to depend on the host isa

RISC-V: KVM: Change zicbom/zicboz block size to depend on the host isa

The zicbom/zicboz block size registers should depend on the host's isa,
the reason is that we otherwise create an ioctl order dependency on the VMM.

Signed-off-by: Quan Zhou <zhouquan@iscas.ac.cn>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviwed-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Link: https://lore.kernel.org/r/fef5907425455ecd41b224e0093f1b6bc4067138.1754646071.git.zhouquan@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>