ARM64: record vtimer tick when cpu is stopped

The vtimer kick still increases even if the vcpu is stopped when VM has
save/restore or suspend/resume operation. This will cause guest watchdog
soft-lockup if the VM has lots of memory in use.

Signed-off-by: Hao Hong <honghao5@huawei.com>
Signed-off-by: Haibin Wang <wanghaibin.wang@huawei.com>
Signed-off-by: Ying Fang <fangying1@huawei.com>