KVM: arm64: Rename 'struct pv_sched_ops'

hulk inclusion
category: feature
bugzilla: 169576
CVE: NA

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Refer to x86, rename 'struct pv_sched_ops sched' to
'struct pv_lock_ops lock' to prepare for supporting CNA on arm64.

Signed-off-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>