seed_everything function doesn't handle HPU (#384)

This PR adds manual seed setting for HPU in the function
`seed_everything`.

Previously the torch.manual_seed was getting set to the given seed,
which got removed in the following PR
6ffa3f3

vllm/utils.py

@@ -413,6 +413,9 @@ def seed_everything(seed: int) -> None:
     if is_xpu():
         torch.xpu.manual_seed_all(seed)
 
+    if current_platform.is_hpu():
+        torch.hpu.manual_seed_all(seed)
+
 
 def random_uuid() -> str:
     return str(uuid.uuid4().hex)