[XPU] fp16/bf16 for multinomial op

[houj04]

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Description

在较早的飞桨XPU版本中，multinomial算子不支持float16数据类型，所以在这个PR #8787 中进行了一个特殊处理，进行了一次数据类型转换。

现在飞桨的develop分支下，XPU版本中，已经支持了float16和bfloat16数据类型，见这两个PR PaddlePaddle/Paddle#69767 、PaddlePaddle/Paddle#69898 ，因此在组网代码里面不再需要这个多出来的cast操作了。

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.00%. Comparing base (2c1387f) to head (7a08a16).
Report is 149 commits behind head on develop.

❌ Your project check has failed because the head coverage (53.00%) is below the target coverage (58.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9550      +/-   ##
===========================================
+ Coverage    52.85%   53.00%   +0.14%     
===========================================
  Files          700      701       +1     
  Lines       110418   111140     +722     
===========================================
+ Hits         58359    58907     +548     
- Misses       52059    52233     +174     

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[github-actions]

This Pull Request is stale because it has been open for 60 days with no activity. 当前Pull Request 60天内无活动，被标记为stale。