!3958 Revert "drm/prime: Unexport helpers for fd/handle conversion"

Merge Pull Request from: @ci-robot 
 
PR sync from: Chen Haixiang <chenhaixiang3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/VM5KBVES52HQ5PRA55TSKRTXUCUKGMIJ/ 
 
https://gitee.com/openeuler/kernel/issues/I8VGWZ 
 
Link:https://gitee.com/openeuler/kernel/pulls/3958

 

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