What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind feature

What does this PR do / why do we need it:
delete seed0 and seed1 in Dropout class

Which issue(s) this PR fixes:

Fixes #
【STABLE】【易用性】nn.Dropout ascend需要多设置连个随机参数，seed参数只对Ascend生效
https://gitee.com/mindspore/dashboard?issue_id=I1SITB
Special notes for your reviewers: