Fix GPU-ResizeNearestNeighbor · Pull Request !3760 · MindSpore/mindspore

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**What type of PR is this?**
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> /kind bug
> /kind task
> /kind feature

**What does this PR do / why do we need it**:

1. Some modifications on coding style
2. Fix int32 bug in ResizeNearestNeighbor and  ResizeNearestNeighborGrad
3. Fix ResizeNearestNeighborGrad
4. Add support to atomicadd half
5. Update testcases

**Which issue(s) this PR fixes**:

Fixes #
[CT][MS][GPU]operator resizenearestneighbor grad_cmp exist a precision problem 
https://gitee.com/mindspore/dashboard/issues?id=I1PMQ0
[CT][MS]resizenearestneighborGrad caculation result is wrong 
https://gitee.com/mindspore/dashboard/issues?id=I1PJE6
**Special notes for your reviewers**:

GVPMindSpore/mindspore

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