KVM: cpuid: remove has_leaf_count from struct kvm_cpuid_param

mainline inclusion
from mainline-v5.3-rc1
commit 60cec433
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I3YAEG


CVE: NA

-----------------------------

The has_leaf_count member was originally added for KVM's paravirtualization
CPUID leaves.  However, since then the leaf count _has_ been added to those
leaves as well, so we can drop that special case.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jingyi Wang <wangjingyi11@huawei.com>
Reviewed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>