KABI: add KABI padding to x86/paravirt ops structures

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4JBL0


CVE: NA

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Although CONFIG_PARAVIRT_XXL is not enabled in openeuler_defconfig,
we add KABI padding to the following x86/paravirt ops structures
in advance for potential kabi break:

    pv_irq_ops
    pv_mmu_ops
    pv_lock_ops

Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>