[MISC] Remove useless patch

[wangxiyuan]

What this PR does / why we need it?

stateless_init_dp_group in vllm works with non-cuda platform now. Remove this useless patch.

Which was introduced in vllm-ascend by e74331a (v0.8.4rc2)
vLLM upstream merged: vllm-project/vllm@3e472d8 (v0.8.0)

Does this PR introduce any user-facing change?

No

How was this patch tested?

CI passed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.32%. Comparing base (c30ddb8) to head (a332a5c).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1366      +/-   ##
==========================================
- Coverage   27.39%   27.32%   -0.08%     
==========================================
  Files          56       56              
  Lines        6191     6178      -13     
==========================================
- Hits         1696     1688       -8     
+ Misses       4495     4490       -5     

Flag	Coverage Δ
unittests	27.32% <ø> (-0.08%)	⬇️

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[Yikun]

This patch was introduced in vllm-ascend by e74331a (v0.8.4rc2)
vLLM upstream merged: vllm-project/vllm@3e472d8 (v0.8.0)

@ganyi1996ppo Could you tell me why we need this patch before? Any special reason here?

[ganyi1996ppo]

This patch was introduced in vllm-ascend by e74331a (v0.8.4rc2) vLLM upstream merged: vllm-project/vllm@3e472d8 (v0.8.0)

@ganyi1996ppo Could you tell me why we need this patch before? Any special reason here?

Mainly because of that we want to adopt hccl backend on stateless process group, but we don't actually needs this now. I also think this patch should be removed.