x86: KVM: Fixed the bug that WAITmax cannot be updated in real time

virt inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I53PTV?from=project-issue


CVE: NA

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Since the reset function is in kvm_intel module instead of kvm
module, the attribute weak function in kvm_main.c could not be found, which
would cause st_max in X86 never be refreshed.
The solution is to define the reset function in x86.c under the kvm module.

Signed-off-by: liangtian <liangtian13@huawei.com>
Reviewed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>