KVM: arm64: Support pvsched preempted via shared structure

virt inclusion
category: feature
bugzilla: 47624
CVE: NA

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Implement the service call for configuring a shared structure between a
vCPU and the hypervisor in which the hypervisor can tell the vCPU that is
running or not.

Signed-off-by: Zengruan Ye <yezengruan@huawei.com>
Reviewed-by: Zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>