[Platform] Deprecate seed_everything (#31659)

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

tests/kernels/attention/test_cpu_attn.py

@@ -8,6 +8,7 @@ import pytest
 import torch
 
 from vllm.platforms import CpuArchEnum, current_platform
+from vllm.utils.torch_utils import set_random_seed
 from vllm.v1.attention.backends.cpu_attn import _get_attn_isa
 
 if not current_platform.is_cpu():
@@ -190,7 +191,7 @@ def varlen_with_paged_kv(
     use_sink: bool,
     isa: str,
 ) -> None:
-    current_platform.seed_everything(0)
+    set_random_seed(0)
     num_seqs = len(seq_lens)
     query_lens = [x[0] for x in seq_lens]
     kv_lens = [x[1] for x in seq_lens]