!3148 vdpa: add vmstate header file

Merge Pull Request from: @ci-robot 
 
PR sync from: Jiang Dongxu <jiangdongxu1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/MRQTAPYT5E5CJHDHO4AAPW4CU6RGLPPV/ 
 
https://gitee.com/openeuler/kernel/issues/I86ITO 
 
Link:https://gitee.com/openeuler/kernel/pulls/3148

 

Reviewed-by: Kevin Zhu <zhukeqian1@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>