KVM: arm64: vgic: Use vcpu_idx for the debug information

When dumping the debug information, use vcpu_idx instead of vcpu_id,
as this is independent of any userspace influence.

Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230927090911.3355209-6-maz@kernel.org


Signed-off-by: Oliver Upton <oliver.upton@linux.dev>