Merge Pull Request from: @fary86 
 
Fix write sysfs file `/sys/kernel/PBK/pbk_create_domain` bug
Details: do operations in the bellowing order would cause the system reboot:
echo 1 > /sys/kernel/PBK/pbk_create_domain
echo 2 > /sys/kernel/PBK/pbk_create_domain
echo 1 > /sys/kernel/PBK/pbk_create_domain
 
 
Link:https://gitee.com/openeuler/kernel/pulls/83

 
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>