!3259 mbigen: vtimer: isolate mbigen vtimer funcs with macro

Merge Pull Request from: @sundongx 
 
https://gitee.com/src-openeuler/kernel/issues/I8MG11 
 
Link:https://gitee.com/openeuler/kernel/pulls/3259

 

Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>