Support both "voice" and "speaker" params in chat completions (#3248)

Signed-off-by: Mike_Qiu <qiudayu.qdy@antgroup.com>
Co-authored-by: Mike_Qiu <qiudayu.qdy@antgroup.com>
Co-authored-by: Yueqian Lin <70319226+linyueqian@users.noreply.github.com>

vllm_omni/entrypoints/openai/serving_chat.py

@@ -560,7 +560,7 @@ class OmniOpenAIServingChat(OpenAIServingChat, AudioMixin):
         if hasattr(request, "cache_salt") and request.cache_salt is not None:
             engine_prompt["cache_salt"] = request.cache_salt
 
-        speaker = getattr(request, "speaker", None)
+        speaker = getattr(request, "voice", None) or getattr(request, "speaker", None)
         normalized = validate_requested_speaker(speaker, self._get_supported_speakers())
         if normalized is not None:
             if "additional_information" not in engine_prompt or engine_prompt["additional_information"] is None: