KVM: arm64: Add support for probing Hisi ncsnp capability

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4IZOS


CVE: NA

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Kunpeng 920 offers the HHA ncsnp capability, with which hypervisor doesn't
need to perform a lot of cache maintenance like before (in case the guest
has some non-cacheable Stage-1 mappings). Currently we apply this hardware
capability when

 - vCPU switching MMU+caches on/off
 - creating Stage-2 mappings for Daborts

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>