KVM: arm64: GICv4.1: Add support for MBIGEN save/restore

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8K89F


CVE: NA

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Add support for MBIGEN save/restore.

Signed-off-by: wanghaibin <wanghaibin.wang@huawei.com>
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Dongxu Sun <sundongxu3@huawei.com>